During the period when
Umar's general,
'Amr ibn al-'As, also known as Amru to the
Romans, posed a threat to the
Prefecture of
Egypt, Cyrus was both the
governor of Egypt and the government-appointed
Patriarch of Alexandria, and
Theodore was the
commander-in-chief of the
Byzantine army in the province. At this time, the governor of Faiyum was Domentianus (who was married to Cyrus' sister), while Anastasius was the prefect of its province,
Arcadia Aegypti, and Theodosius was the prefect of
Alexandria. The defence of Arcadia Aegypti was entrusted to a certain John, whom
Hermann Zotenberg identifies with the
John, Duke of Barca or Barcaina mentioned by
Nicephorus. He had brought the
Ecthesis and a portion of the
True Cross from
Patriarch Sergius to Cyrus, and was likely on a direct commission from Emperor
Heraclius. For three years after the
Muslim conquest of the Levant, Cyrus paid them tribute not to conquer Egypt. When the Arabs entered Egypt and besieged
Pelusium for two months, Cyrus did not react at all (although his daughter
Armenousa may have sent reinforcements there). The city eventually fell in February 640.
Loss of Belbeis After taking Pelusium, the Muslims marched on to
Belbeis. Two Christian monks, accompanied by Cyrus of Alexandria and the famous Roman general
Aretion, came out to negotiate with 'Amr ibn al-'As. Aretion had been the Byzantine governor of
Jerusalem, but had gone to Egypt shortly after losing the
Battle of Ajnadayn. 'Amr gave them three options: convert to Islam, pay the
jizya, or fight. They requested three days to reflect and then, according to
Al-Tabari, requested two extra days. At the end of the five days, Aretion, the two monks, and Armenousa decided to reject Islam and the jizya and fight the Muslims, thus disobeying Cyrus, who wanted to surrender and pay jizya. Cyrus left for the
Babylon Fortress. The battle resulted in a Muslim victory during which Aretion was killed and Armenousa was captured, but sent back to Cyrus. 'Amr ibn al-'As subsequently attempted to convince the native Egyptians to aid the Arabs and surrender the city, based on the kinship between Egyptians and Arabs via
Hajar. Cyrus asked Heraclius to ratify the treaty and offered an argument in support. 'Amr submitted a detailed report to Umar recommending ratification. Upon hearing about this, Heraclius was furious and had Cyrus recalled to
Constantinople. Cyrus tried to defend his actions, but Heraclius angrily threatened to kill him, calling him an abject coward and a heathen, and asking whether 100,000 Romans were a match for 12,000 barbarians. He then handed him to the city Prefect to humiliate him, and sent him to exile.
Summons to Constantinople Heraclius died in February 641, two months before the fall of the
Babylon Fortress, and was succeeded by his two sons
Constantine III and
Heraclonas as co-emperors. Heraclonas' mother,
Martina, ruled through Heraclonas because of his young age and consistently opposed Constantine. Constantine, following his father's wishes, summoned Cyrus from exile and Theodore from Egypt to
Constantinople to discuss the invasion. Cyrus was in favour of surrendering to the Muslims, whereas Theodore wanted to continue fighting them and hoped the Emperor would send reinforcements to Egypt. Constantine had been preparing a fleet to send to Egypt, but died on May 25 after a reign of just 100 days. With
Heraclonas as sole emperor, Martina gained complete control over the government. She had Heraclonas give Cyrus express permission to make peace at any price with the Arabs, but also gave him reinforcements and a new general named Constantine to replace John. After Theodore and Cyrus' left for Egypt with reinforcements, Martina was deposed by
Valentine, who sent envoys to
Rhodes with a message to Cyrus' troops, telling them to return to Constantinople and not to side with Cyrus. He also sent a letter to Alexandria telling the defenders not to obey Martina, and to keep fighting. Theodore was pleased to hear this, and without telling Cyrus or anyone but the captain, he secretly attempted to sail from Rhodes to
Pentapolis. However, the captain of the ship claimed the wind was contrary to him, and Theodore was stuck with Cyrus. They returned to
Alexandria on September 14, 641, the
Feast of the Cross. was carried with Cyrus and Theodore. The procession passed between
Cleopatra's Needles and entered the
Caesareum Church, where a
liturgy was prayed. Cyrus then gave a sermon about the
discovery of the True Cross, perhaps encouraging them to resist the siege in the name of the Cross, despite having already decided in himself to forsake the Cross and surrender to the Muslims. Cyrus then went to Babylon to negotiate with 'Amr, and agreed the following treaty: • Payment of a fixed tribute by all who came under the treaty. • An armistice of about eleven months, to expire the first day of the Coptic month Paophi, i.e. September 28, 642. • During the armistice the Arab forces to maintain their positions, but to keep apart and undertake no military operations against Alexandria; the Roman forces to cease all acts of hostility. • The garrison of Alexandria and all troops there to embark and depart by sea, carrying all their possessions and treasure with them: but any Roman soldiers quitting Egypt by land to be subject to a monthly tribute on their journey. • No Roman army to return or attempt the recovery of Egypt. • The Muslims to desist from all seizure of churches, and not to interfere in any way with the Christians. • The Jews to be suffered to remain at Alexandria. • Hostages to be given by the Romans, viz. 150 military and 50 civilian, for the due execution of the treaty. He then returned to Alexandria and reported the terms of this humiliating treaty to Theodore and Constantine, convincing them that it was necessary and telling them to report it to the Emperor
Heraclonas, who ratified it in what may had been his last act as Emperor, as he was deposed in November. The local populace was not informed of it until an Arab army approached Alexandria to receive the tribute, and the Byzantine generals told the people not to resist. Realising what had happened, a furious mob attempted to
stone Cyrus, but he said to them "I have made this treaty in order to save you and your children" and wept before them, which calmed the riot. The first installment of tribute was paid on 10 December 641, sealing the surrender of Alexandria. ==Death==