Relations of Venice and the Ottoman Empire In 1413, the
Ottoman prince
Mehmed I ended the civil war of the
Ottoman Interregnum and established himself as
sultan and the sole master of the Ottoman Turkish realm. The
Republic of Venice, as the premier maritime and commercial power in the area, endeavoured to renew the treaties it had concluded with Mehmed's predecessors during the civil war, and in May 1414, its (resident ambassador) in the
Byzantine capital,
Constantinople,
Francesco Foscarini, was instructed to proceed to the Sultan's court to that effect. Foscarini failed, as Mehmed was away campaigning in
Anatolia, and Venetian envoys were traditionally instructed not to move too far from the shore (and consequently the Republic's reach); Foscarini had yet to meet the Sultan by July 1415, when Mehmed's displeasure at this delay was conveyed to the Venetian authorities. In the meantime, tensions between the two powers mounted, as the Ottomans moved to re-establish a sizeable navy and launched several raids that challenged Venetian naval hegemony in the
Aegean Sea.
Ottoman raids in the Aegean in 1414–1415 During his 1414 campaign in Anatolia, Mehmed came to
Smyrna, where several of the most important
Latin rulers of the Aegean—the
Genoese lords of the northeastern Aegean islands of
Chios,
Phokaia, and
Lesbos, and even the Grand Master of the
Knights Hospitaller of
Rhodes—came to do him obeisance. According to the Byzantine historian
Doukas, a contemporary of the events, the absence of the
Duke of Naxos from this assembly provoked the ire of the Sultan, who in retaliation equipped a fleet of 30 vessels, under the command of Çali Bey, and in late 1415 sent it to raid the duke's domains in the
Cyclades in the southern Aegean Sea. The Ottoman fleet ravaged the islands, and carried off a large part of the inhabitants of
Andros,
Paros, and
Melos into slavery. On the other hand, the 16th-century Venetian historian
Marino Sanuto the Younger indicates that the Ottoman attack was in retaliation for the raids against Ottoman shipping undertaken by
Pietro Zeno, the lord of Andros. Like the Duke of Naxos, Zeno was a Venetian citizen and vassal of the Republic of Venice, but he had not been included in the previous treaties between the Republic and the Ottomans, and had continued raiding Ottoman shipping on his own account. Apart from the attacks on Naxos, Ottoman raids were also directed against immediate Venetian interests. In June 1414, Ottoman ships also raided the Venetian colony of
Euboea, an island off the eastern shore of mainland Greece. The Ottomans pillaged the colony's capital,
Negroponte, taking almost all its inhabitants prisoner; out of some 2,000 captives, the Republic was able after years to secure the release of only 200, mostly elderly men, women, and children, the rest having been sold as slaves. Furthermore, in the autumn of 1415, ostensibly in retaliation for Zeno's attacks, an Ottoman fleet of 42 ships—6
galleys, 26
galleots, and the rest smaller
brigantines—tried to intercept a Venetian
merchant convoy coming from the
Black Sea at the island of
Tenedos, at the southern entrance of the
Dardanelles. The Venetian vessels were delayed at Constantinople by bad weather, but managed to pass through the Ottoman fleet and outrun its pursuit to the safety of Negroponte. The Ottoman fleet instead raided Euboea, including an attack on the fortress of
Oreos (Loreo) in northern Euboea, but its defenders under the
castellan Taddeo Zane resisted with success. Nevertheless, the Turks were able to once again ravage the rest of the island, carrying off 1,500 captives, so that the local inhabitants even petitioned the
Signoria of Venice for permission to become tributaries of the Turks to guarantee their future safety—a demand categorically rejected by the Signoria on 4 February 1416. The raids spread considerable panic:
Lepanto on the western coast of Greece was deserted, and at Venice no one was found who wanted to contract, not even for a small sum, the right to equip merchant galleys bound for Constantinople, or the Black Sea ports of
Tana and
Trebizond. Due to the lucrative trade opportunities these ports offered, the contracts ordinarily fetched prices of up to 2,000
ducats, but now the Venetian government was obliged to supply armed escorts for the merchant galleys at its own expense. Nevertheless, the same missives to Venice also highlighted the bad state of the Turkish fleet, especially of its crews; and expressed the certainty that if a Venetian fleet had been present to confront them, it would have been victorious.
Diplomatic and military response of Venice In response to the Ottoman raids, the
Great Council of Venice engaged in feverish military preparations. A half-percent levy was raised on goods, soldiers and crossbowmen were recruited, and the experienced
Pietro Loredan was appointed
Captain of the Gulf, at the head of a fleet of fifteen galleys; five were to be equipped in Venice, four at
Candia (Crete), and one each at Negroponte, Napoli di Romania (
Nauplia), Andros, and
Corfu. Loredan's brother Giorgio, Jacopo Barbarigo, Cristoforo Dandolo, and Pietro Contarini were appointed as (galley captains), while Andrea Foscolo and Dolfino Venier were designated as (commissioners) of the fleet and ambassadors to the Sultan. While Foscolo was charged with a mission to the
Principality of Achaea in southern Greece, Venier was tasked with reaching a new agreement with the Sultan on the basis of the
treaty concluded between
Musa Çelebi and the Venetian ambassador Giacomo Trevisan in 1411, and with securing the release of the Venetian prisoners taken from Negroponte in 1414. Should negotiations fail, he was empowered to seek to form an anti-Ottoman league with the
Bey of Karaman, the
Prince of Wallachia, and the rebellious Ottoman prince
Mustafa Çelebi. Loredan's appointment was unusual, as he had served recently as Captain of the Gulf, and law forbade anyone who had held the position from holding the same for three years after; the Great Council overrode this rule due to the
de facto state of war with the Ottomans. In a further move calculated to bolster Loredan's authority (and appeal to his vanity), an old rule that had fallen into disuse was revived, whereby only the captain-general had the right to carry the
Banner of Saint Mark on his flagship, rather than every . With "rare unanimity", the Great Council voted to authorize Loredan to attack Ottoman possessions if the Ottomans had continued their raids in the meantime. If they were unwilling to negotiate a cessation of hostilities, he was to protect Venetian shipping and attack the Ottomans, without however putting his ships in excessive danger. Nevertheless, the emphasis of the Council's instructions was to ensure peace, and Loredan's squadron was intended as a form of military pressure to expedite negotiations. As no further news of Ottoman attacks arrived until Loredan sailed in April, the expectation in the Venetian government was that the matter would likely be resolved peacefully.
Role of Gallipoli and their vicinity. Gallipoli (Gelibolu) is marked on the northern entrance of the straits. The main target of Loredan's fleet was to be
Gallipoli. Described by the Italian naval historian
Camillo Manfroni as the "key of the Dardanelles", the city was one of the most important strategic positions in the Eastern Mediterranean. At the time it was also the main Turkish naval base and provided a safe haven for their corsairs raiding Venetian colonies in the Aegean. With Constantinople still in Christian hands, Gallipoli had also for decades been the main crossing point for the Ottoman armies from Anatolia to Europe. As a result of its strategic importance, Sultan
Bayezid I took care to improve its fortifications, rebuilding the citadel and strengthening the harbour defences. The harbour had a seaward wall and a narrow entrance leading to an outer basin, separated from an inner basin by a bridge, where Bayezid erected a three-storey tower (the ). When
Ruy González de Clavijo visited the city in 1403, he reported seeing its citadel full of troops, a large arsenal, and 40 ships in the harbour. Bayezid aimed to use his warships in Gallipoli to control (and tax) the passage of shipping through the Dardanelles, an ambition which brought him into direct conflict with Venetian interests in the area. While the Ottoman fleet was not yet strong enough to face the Venetians, it forced the latter to provide armed escort to their trade convoys passing through the Dardanelles. Securing right of unimpeded passage through the Dardanelles was a chief issue in Venice's diplomatic relations with the Ottomans: the Republic had secured this in the 1411 treaty with Musa Çelebi, but the failure to renew that agreement in 1414 had again rendered Gallipoli, in the words of the 20th-century
Ottomanist Halil İnalcık, "the main object of dispute in Venetian-Ottoman relations". The Ottoman naval raids in 1415, launched from Gallipoli, further underscored its importance. ==Battle==