On landing there, Nicolo was met by news of the death of his wife, and of the birth of his son, who had been born shortly after his departure in 1254; this son was the celebrated Marco Polo. The two brothers waited at Venice for the election of the Pope, but at the end of two years, as it had not taken place, they thought they could no longer defer their return to the Emperor of the Mongols; accordingly they started for Acre, taking Marco Polo with them, who could not then have been more than seventeen. At Acre they had an interview with the legate Theobald, who authorized them to go to Jerusalem and there to procure some of the sacred oil. This mission accomplished, the Venetians returned to Acre and asked the legate to give them letters to Kublai-Khan, mentioning the death of Pope Clement IV.; he complied with their request, and they returned to Laias or Issus. There, to their great joy, they learnt that the legate Theobald had just been made Pope with the title of Gregory X., on the 1st of September, 1271. The newly-elected Pope sent at once for the Venetian envoys, and the King of Armenia placed a galley at their disposal to expedite their return to Acre. The Pope received them with much affection, and gave them letters to the Emperor of China; he added two preaching friars, Nicholas of Vicenza and William of Tripoli, to their party, and gave them his blessing on their departure. They went back to Laias, but had scarcely arrived before they were made prisoners by the soldiers of the Mameluke Sultan Bibars, who was then ravaging Armenia. The two preaching friars were so discouraged at this outset of the expedition that they gave up all idea of going to China, and left the two Venetians and Marco Polo to prosecute the journey together as best they could.