Connected by marriage with the Greek Imperial house, the Genoese lord of Lesbos seems to have met with no resistance from his Greek subjects, who would naturally regard him not so much in the light of an alien conqueror as in that of a lawful ruler by the grace of the Emperor. He soon learnt to speak their language[526], and continued to assist his Greek brother-in-law with advice and personal service. At the moment of his accession, the Greek Empire was menaced by the Turks, who had lately crossed over into Europe, and occupied Gallipoli, and by Matthew Cantacuzene, the eldest son of the deposed Emperor. In the very next year the capture of the Sultan Orkhan’s son, Halil, by Greek pirates from Foglia Vecchia, at that time a Byzantine fief, enabled John V to divide these two enemies by promising to obtain the release of the Sultan’s son. The promise proved, indeed, to be hard of fulfilment, for John Kalothetos, the Greek governor of Foglia Vecchia, resisted the joint attacks of the Emperor and a Turkish chief, whom John V had summoned to aid him, until he received a large ransom and a high-sounding title. It was during these operations, in the spring of 1357, that the Emperor, on the advice of Francesco Gattilusio, treacherously invited his Turkish ally to visit him on an islet off Foglia and then arrested him[527]. Such reliance, indeed, did John place in his brother-in-law, whose interests coincided with his own, that, when Matthew Cantacuzene was captured by the Serbs and handed over to the Emperor, the latter sent the children of his rival to Lesbos, and even meditated sending thither Matthew himself, because he knew that they would be in safe keeping[528]. In 1366, when the Bulgarian Tsar, John Shishman, had treacherously arrested John V, and the Greeks of Byzantium, hard pressed by the Turks, sought the help of the chivalrous _Conte verde_, Amedeo VI of Savoy, Francesco Gattilusio was present with one of his nephews at the siege and capture of Gallipoli from the Ottomans and assisted at the taking of Mesembria from the Bulgarians[529]. But fear of Murad I made him refuse to see or speak to his wife’s nephew, Manuel, when the latter, after plotting against the Sultan, sought refuge in Lesbos[530].