But the Bolognese did not long preserve the liberty which they had recovered. One of their citizens, named Taddeo de Pepoli, the richest man in all Italy, had seduced the German guard which they held in pay, and by its aid took possession of the sovereignty of Bologna on the 28th of August, 1337. He then made alliance with the Ghibellines. The number of the free cities on the aid, or at least the sympathy, of which Florence could reckon continually diminished. The Genoese, from the commencement of the century, had consumed their strength in internal wars between the great Guelf and Ghibelline families; as long as they were free, however, the Florentines, without any treaty of alliance, regarded them as friendly; but the long-protracted civil wars had disgusted the people with the government; they rose on the 23rd of September, 1339, and overthrew it, replacing the signoria by a single chief, Boccanera, on whom they conferred the title of doge. It might have been feared that they had only given themselves a tyrant; but the first doge of Genoa was a friend to liberty; and the Genoese people, having imitated Venice in giving themselves a first officer in the state with that title, were not long before they carried the imitation further, by seeking to combine liberty with power vested in a single person. In the meanwhile Mastino della Scala suffered a Parmesan noble to take from him the city of Parma. As from that time he had no further communication with Lucca, he offered to sell it to the Florentines. The bargain was concluded in the month of August, 1341; but it appeared to the Pisans the signal of their own servitude, for it cut off all communication between them and the Ghibellines of Lombardy. They immediately advanced their militia into the Lucchese states, to prevent the Florentines from taking possession of the town; vanquished them in a great battle, on the 2nd of October, 1341, under the walls of Lucca; and, on the 6th of July following, took possession of that city for themselves.[c]