Meanwhile, as a Genoese, he naturally had difficulties with the Venetians. Thus, we find him capturing[531] in the Ægean a Venetian colonist from Negroponte, and quite early in his reign he imitated the bad example of his predecessor, Domenico Cattaneo, and coined gold pieces in exact counterfeit of the Venetian ducat, although of different weight. This was so serious an offence, that the Venetian Government made a formal complaint at Genoa, and in 1357 the Doge of his native city wrote to Francesco[532] bidding him discontinue this dishonest practice, which augured badly for the future of his administration, and would entail severe penalties upon him, if he insisted in its continuance. Francesco felt himself strong enough to go on his way, heedless of the ducal thunders alike of Genoa and of Venice, and coins of himself and of at least four out of his five successors have been preserved. The great war, which broke out between the two Republics in 1377 on account of the cession of Tenedos by the usurper Andronikos to Genoa and its seizure by Venice, must have placed Francesco in a difficult position. He was, it is true, a Genoese but he was also brother-in-law of John V, whom Andronikos had deposed and who had promised the disputed island, which he and Francesco knew so well, to Venice. Accordingly, when the treaty of Turin imposed upon Venice the surrender of Tenedos to Amedeo VI of Savoy, who was to raze the castle to the ground at the cost of Genoa, yet the islanders none the less swore that they would retain their independence. Muazzo, the Venetian governor, excused his action in refusing to give up the island by pleading Francesco’s intrigues. An agent of the Lesbian lord, he wrote, one Raffaele of Quarto, had stirred up the inhabitants, some 4000 in number, to resist the cession, by spreading a rumour that, if Tenedos fell into Genoese hands, the Venetian colonists would all be forced to turn Jews or emigrate[533]. When, however, Venice found herself reluctantly compelled to force her recalcitrant officer to carry out the provisions of the treaty, Francesco helped to victual the Venetian fleet, and Tenedos was reduced to be the desert that it long remained.