Along with Pietro Zeno, he negotiated the ten-year peace treaty with the Byzantine emperor Michael VIII Palaiologos, signed at Constantinople on 4 April 1268.[1][2] In 1269–1270 he served as one of the castellansofCoron, during which time he dealt with the murder of a Venetian archdeacon by a Byzantine sebastokrator (possibly the half-brother of the Emperor, Constantine), who had been captured on a ship off the Morea.[3][4] In 1270–1271 he was Bailo of Constantinople, and in 1273–1274 Bailo of Negroponte.[1] In 1275 he was sent on an embassy to Genoa with Giovanni Corner,[1] and in the next year, he was sent to negotiate a new treaty with the Byzantine Emperor, along with Matteo Gradenigo. Gradenigo died during the long negotiations, and the two-year agreement was finally concluded by Bembo alone on 19 March 1277.[1][5]
