The Venetians were zealous guarding the right to Tenedos the Treaty of Turin provided them. The Grand Master of the Knights of Rhodes wanted to build a fortification at the island in 1405, with the knights bearing the cost, but the Venetians refused to allow this. The island remained largely uninhabited for the next decades. When Ruy Gonzáles de Clavijo visited the island in 1403 he remarked that because of the Treaty of Turin "Tenedos has since come to be uninhabited." 29 May 1416 saw the first battle at sea between the Venetians and the emerging Ottoman fleet at Gallipoli. The Venetian captain-general, Pietro Loredan, won, wiped out the Turks on board, and retired down the coast to Tenedos, where he killed all the non-Turk prisoners who had voluntarily joined the Turks. In the treaty of 1419 between Sultan Mehmed and the Venetians, Tenedos was the dividing line beyond which the Turkish fleet was not to advance. Spanish adventurer Pedro Tafur visited the island in 1437 and found it deserted, with many rabbits, the vineyards covering the island in disrepair, but the port well-maintained. He mentioned frequent Turkish attacks on shipping in the harbor. In 1453, the port was used by the commander of a single-ship Venetian fleet, Giacomo Loredan, as a monitoring point to observe the Turkish fleet, on his way to Constantinople in what would become the final defense of that city against the Turks.