Italy Charles's wife, Beatrice of Provence, had died in July 1267. The widowed Charles married
Margaret of Nevers in November 1268. She was co-heiress to her father,
Odo, the eldest son of
Hugh IV, Duke of Burgundy. Pope Clement died on 29November 1268. The papal vacancy lasted for three years, which strengthened Charles's authority in Italy, but it also deprived him of the ecclesiastic support that only a pope could provide. Charles returned to Lucera to personally direct its siege in April 1269. The Saracens and the Ghibellines who had escaped to the town resisted until starvation forced them to surrender in August 1269. Charles sent Philip and
Guy of Montfort to Sicily to force the rebels there into submission, but they could only capture
Augusta. Charles made
William l'Estandart the commander of the army in Sicily in August 1269. L'Estandart captured
Agrigento, forcing Frederick of Castile and Frederick Lancia to seek refuge in Tunis. After L'Estandart's subsequent victory at
Sciacca, only Capece resisted, but he also had to surrender in early 1270. Charles's troops forced Siena and Pisa—the last towns to resist him in Tuscany—to sue for peace in August 1270. He granted privileges to the Tuscan merchants and bankers which strengthened their position in the Regno. His influence was declining in Lombardy, because the Lombard towns no longer feared an invasion from Germany after Conradin's death. In May 1269 Charles sent Walter of La Roche to represent him in the province, but this failed to strengthen his authority. In October Charles's officials convoked an assembly at Cremona, and invited the Lombard towns to attend. The Lombard towns accepted the invitation, but some towns—Milan, Bologna, Alessandria and Tortona—only confirmed their alliance with Charles, without acknowledging his rule.
Eighth Crusade Louis IX never abandoned the idea of the liberation of Jerusalem, but he decided to begin his new crusade with a military campaign against Tunis. According to his confessor,
Geoffrey of Beaulieu, Louis was convinced that al-Mustansir of Tunis was ready to convert to Christianity. The 13th-century historian
Saba Malaspina stated that Charles persuaded Louis to attack Tunis, because he wanted to secure the payment of the tribute that the rulers of Tunis had paid to the former Sicilian monarchs. The French crusaders embarked at Aigues-Mortes on 2July 1270; Charles departed from Naples six days later. He spent more than a month in Sicily, waiting for his fleet. By the time he landed at Tunis on 25August,
dysentery and
typhoid fever had decimated the French army. Louis died the day Charles arrived. The crusaders twice defeated Al-Mustansir's army, forcing him to sue for peace. According to the peace treaty, signed on 1November, Al-Mustansir agreed to fully compensate Louis' son and successor,
Philip III of France, and Charles for the expenses of the military campaign and to release his Christian prisoners. He also promised to pay a yearly tribute to Charles and to expel Charles's opponents from Tunis. The gold from Tunis, along with silver from the newly opened mine at
Longobucco, enabled Charles to mint new coins, known as , in the Regno. Charles and Philip departed Tunis on 10November. A storm dispersed their fleet at
Trapani and most of Charles's galleys were lost or damaged. Genoese ships returning from the crusade were also sunk or forced to land in Sicily. Charles seized the damaged ships and their cargo, ignoring all protests from the Ghibelline authorities of Genoa. Before leaving Sicily he granted temporary tax concessions to the Sicilians, because he realised that the conquest of the island had caused much destruction.
Attempts to expand Charles accompanied Philip III as far as Viterbo in March 1271. Here they failed to convince the cardinals to elect a new pope. Charles's brother, Alphonse of Poitiers, fell ill. Charles sent his best doctors to cure him, but Alphonse died. He claimed the major part of Alphonse's inheritance, including the
Marquisate of Provence and the
County of Poitiers, because he was Alphonse's
nearest kin. After Philip III objected, he took the case to the
Parlement of Paris. In 1284 the court ruled that appanages
escheated to the French crown if their rulers died without descendants. An earthquake destroyed the walls of Durazzo in the late 1260s or early 1270s. Charles's troops took possession of the town with the assistance of the leaders of the nearby Albanian communities. Charles concluded an agreement with the Albanian chiefs, promising to protect them and their ancient liberties in February 1272. He adopted the title of
King of Albania and appointed
Gazzo Chinardo as his vicar-general. He also sent his fleet to Achaea to defend the principality against Byzantine attacks. Charles hurried to Rome to attend the enthronement of
Pope Gregory X on 27March 1272. The new pope was determined to put an end to the conflicts between the
Guelphs and the Ghibellines. While in Rome Charles met with the Guelph leaders who had been exiled from Genoa. After they offered him the office of
captain of the people, Charles promised military assistance to them. In November 1272 Charles commanded his officials to take prisoner all Genoese within his territories, except for the Guelphs, and to seize their property. His fleet occupied
Ajaccio in Corsica. Pope Gregory condemned his aggressive policy, but proposed that the Genoese should elect Guelph officials. Ignoring the Pope's proposal, the Genoese made alliance with Alfonso X of Castile,
William VII of Montferrat and the Ghibelline towns of Lombardy in October 1273. The conflict with Genoa prevented Charles from invading the
Byzantine Empire, but he continued to forge alliances in the Balkan Peninsula. The Bulgarian ruler,
Konstantin Tih, was the first to conclude a treaty with him in 1272 or 1273.
John I Doukas of Thessaly and
Stefan Uroš I, King of Serbia, joined the coalition in 1273. However, Pope Gregory forbade Charles to attack, because he hoped to unify the
Orthodox and Catholic churches with the assistance of Emperor Michael VIII. The renowned theologian
Thomas Aquinas died unexpectedly near Naples on 7March 1274, before departing to attend the
Second Council of Lyon. According to a popular legend, immortalised by
Dante Alighieri, Charles had him poisoned, because he feared that Aquinas would make complaint against him. The historian
Steven Runciman emphasises that "there is no evidence for supposing that the great doctor's death was not natural". Southern Italian churchmen at the council accused Charles of tyrannical acts. Their report reinforced the Pope's attempt to reach a compromise with
Rudolf of Habsburg, who had been elected king of Germany by the
prince-electors of the Holy Roman Empire. In June, the Pope acknowledged Rudolf as the lawful ruler of both Germany and Italy. Charles's sisters-in-law, Margaret and Eleanor, approached Rudolf, claiming that they had been unlawfully disinherited in favour of Charles's late wife. Michael VIII's personal envoy announced at the Council of Lyon on 6July that he had accepted the
Catholic creed and
papal primacy. About three weeks later, Pope Gregory again prohibited Charles from launching military actions against the Byzantine Empire. The Pope also tried to mediate a truce between Charles and Michael, but the latter chose to attack several smaller states in the Balkans, including Charles's vassals. The Byzantine fleet took control of the maritime routes between Albania and southern Italy in the late 1270s. Gregory only allowed Charles to send reinforcements to Achaea. The organisation of a new crusade to the Holy Land remained the Pope's principal object. He persuaded Charles to start negotiations with
Maria of Antioch about purchasing her claim to the
Kingdom of Jerusalem. The
High Court of Jerusalem had already rejected her in favour of
Hugh III of Cyprus, but the Pope had a low opinion of Hugh. The war with Genoa and the Lombard towns increasingly occupied Charles's attention. He appointed his nephew
Robert II of Artois as his deputy in Piedmont in October 1274, but Artois could not prevent
Vercelli and Alessandria from joining the Ghibelline League. The following summer, a Genoese fleet plundered Trapani and the island of
Gozo. Convinced that only Rudolf I could achieve a compromise between the Guelphs and Ghibellines, the Pope urged the Lombard towns to send envoys to him. He also urged Charles to renounce Tuscany. In the autumn of 1275 the Ghibellines offered to make peace with Charles, but he did not accept their terms. Early the next year the Ghibellines defeated his troops at
Col de Tende, forcing them to withdraw to Provence.
Papal elections Pope Gregory X died on 10January 1276. After the hostility he experienced during Gregory's pontificate, Charles was determined to secure the election of a pope willing to support his plans. Gregory's successor,
Pope Innocent V, had always been Charles's partisan and he rapidly confirmed Charles as senator of Rome and imperial vicar of Tuscany. He also mediated a peace treaty between Charles and Genoa, which was signed in Rome on 22June 1276. Charles restored the privileges of the Genoese merchants and renounced his conquests, and the Genoese acknowledged his rule in Ventimiglia. Pope Innocent died on 30June 1276. After the cardinals assembled in the
Lateran Palace, Charles's troops surrounded it, enabling only his allies to communicate with other cardinals and with outsiders. On 11July the cardinals elected Charles's old friend,
Ottobuono de' Fieschi, pope, but he died on 18August. The cardinals met again, this time at Viterbo. Although Charles was staying in the nearby Vetralla, he could not directly influence the election, because his vehement opponent, Cardinal
Giovanni Gaetano Orsini, dominated the
papal conclave.
Pope John XXI, who was elected on 20September, excommunicated Charles's opponents in Piedmont and prohibited Rudolf from coming to Lombardy, but did not forbid the Lombardian Guelph leaders swearing fealty to Rudolf. The Pope also confirmed the treaty concluded by Charles and Maria of Antioch on 18March which transferred her claims to Jerusalem to Charles for 1,000 bezants and a pension of 4,000 . c. 1277 Charles appointed
Roger of San Severino to administer the Kingdom of Jerusalem as his
bailiff. San Severino landed at Acre on 7June 1277. Hugh III's bailiff,
Balian of Arsuf, surrendered the town without resistance. Although initially only the
Knights Hospitaller and the Venetians acknowledged Charles as the lawful ruler, the barons of the realm also paid homage to San Severino in January 1278, after he had threatened to confiscate their estates. The
Mamluks of Egypt had already confined the kingdom to a coastal strip covering and Charles had ordered San Severino to avoid conflicts with Egypt. Pope John died on 20May 1277. Charles was ill and could not prevent the election of Giovanni Gaetano Orsini as Pope Nicholas III on 25November. The Pope soon declared that no foreign prince could rule in Rome and reminded Charles that he had been elected senator for ten years. Charles swore fealty to the new pope on 24May 1278 after lengthy negotiations. He had to pledge that he would renounce both the senatorship of Rome and the vicariate of Tuscany in four months. On the other hand, Nicholas III confirmed the excommunication of Charles's enemies in Piedmont and started negotiations with Rudolf to prevent him from making an alliance against Charles with Margaret of Provence and her nephew,
Edward I of England. The negotiations with Rudolf lay behind Nicholas' refusal to renew Charles's vicariate in Tuscany, to which Rudolf had appointed his own vicar. Charles announced his resignation from the senatorship and the vicariate on 30August 1278. He was succeeded by the Pope's brother,
Matteo Orsini, in Rome, and by the Pope's nephew, Cardinal Latino Malabranca, in Tuscany. To ensure that Charles fully abandoned his ambitions in central Italy the Pope started negotiations with Rudolf about the restoration of the Kingdom of Arles for Charles's grandson,
Charles Martel. Margaret of Provence sharply opposed the plan, but Philip III of France did not stand by his mother. After lengthy negotiations, in the summer of 1279 Rudolf recognised Charles as the lawful ruler of Provence without demanding his oath of fealty. An agreement about Charles Martel's rule in Arles and his marriage to Rudolf's daughter,
Clemence, was signed in May 1280. The plan disturbed the rulers of the lands along the Upper Rhone, especially
Duke Robert II and
Count Otto IV of Burgundy. Charles had meanwhile inherited the
Principality of Achaea from William II of Villehardouin, who had died on 1May 1278. He appointed the unpopular of Sicily,
Galeran of Ivry, as his baillif in Achaea. Galeran could not pay his troops who started to pillage the peasants' homes.
John I de la Roche, Duke of Athens, had to lend money to him to finance their salaries.
Nicephoros I of Epirus acknowledged Charles's suzerainty on 14March 1279 to secure his assistance against the Byzantines. Nicephoros also ceded three towns—
Butrinto,
Sopotos and
Panormos—to Charles. Pope Nicholas died on 22August 1280. Charles sent agents to Viterbo to promote the election of one of his supporters, taking advantage of the rift between the late Pope's relatives and other Italian cardinals. When a riot broke out in Viterbo, after the cardinals had not reached a decision for months, Charles's troops took control of the town. On 22February 1281 his staunchest supporter, Simon of Brie, was elected pope. Pope Martin IV dismissed his predecessor's relatives and made Charles the senator of Rome again.
Guido I da Montefeltro rose up against the Pope, but Charles's troops under
Jean d'Eppe stopped the spread of the rebellion at
Forlì. Charles also sent an army to
Piedmont, but
Thomas I, Marquess of Saluzzo, annihilated it at
Borgo San Dalmazzo in May.
Crusade against Byzantium Pope Martin excommunicated Emperor Michael VIII on 10April 1281 because the Emperor had not imposed the Church union in his empire. The Pope soon authorised Charles to invade the empire. Charles's vicar in Albania,
Hugh of Sully, had already
laid siege to the Byzantine fortress of Berat. A Byzantine army of relief under
Michael Tarchaneiotes and
John Synadenos arrived in March 1281. Sully was ambushed and captured, his army put to flight and the interior of Albania was lost to the Byzantines. On 3July 1281 Charles and his son-in-law,
Philip of Courtenay, the titular Latin emperor, made an alliance with
Venice "for the restoration of the Roman Empire". They decided to start a full-scale campaign early the next year. Margaret of Provence called Robert and Otto of Burgundy and other lords who held fiefs in the Kingdom of Arles to a meeting at
Troyes in the autumn of 1281. They were willing to unite their troops to prevent Charles's army from taking possession of the kingdom, but Philip III of France strongly opposed his mother's plan and Edward I of England would not promise any assistance to them. Charles acknowledged that his wife held the
County of Tonnerre and her other inherited estates as a Burgundian fief, which appeased Robert of Burgundy. Charles's ships started to assemble at Marseilles to sail up the Rhone in the spring of 1282. Another fleet was gathering at Messina to start the crusade against the Byzantine Empire. ==The empire's collapse==