In Florence, a city that was eager to build up a network of bases in the Levant, Alighieri negotiated a treaty between Florence and David of Trebizond granting to the city a consulate ("fondaco") and trading terms that included a 2% levy on exports, as were enjoyed by the Genoese and Venetians in Trebizond. Like his ancestor, Dante Alighieri, Michael Alighieri was a Florentine, but had been trading on his own account in the Black Sea. Bryer mentions a document dated 28 April 1470, wherein the protectors of the Bank of St. George at Caffa gave Michael Alighieri safe conduct which covered his children and subordinates. Bryer treats Ludovico da Bologna's claims with a degree of mistrust and suspicion, noting Ludovico "seems to have been too glib and later obsessed with something of the attitude of a Baron Corvo towards the Church, which failed to take his personal ambitions seriously." On the other hand, Bryer assumes Michael Alighieri was a legitimate representative of Emperor David, although the letter he bore from David to Duke Philip the Good of Burgundy "was written, if not in Italy, from an Italian point of view, and by someone who knew Trebizond well and had recently seen David Komnenos as the new Emperor." William Miller, in his account of the Empire of Trebizond, likewise assumes Michael Alighieri was the legitimate representative, while ignoring the existence of the sketchy Ludovico da Bologna, who had been the primary advocate for a Christian league.