The first of Arghun's embassies was led by Isa Kelemechi, a Christian Assyrian interpreter who had been head of Kublai Khan's Office of Western Astronomy and sent to Greater Iran at the order of the Great Khan. The embassy was sent because the Great Khan Kublai (Qubilai) ordered Arghun to free Holy Land and protect Christians. Kelemechi met with Pope Honorius IV in 1285, offering to "remove" the Saracens (Muslims) and divide "the land of Sham, namely Egypt" with the Franks. The second embassy, and probably the most famous, was that of the elderly cleric Rabban Bar Sauma, who had been visiting the Ilkhanate during a remarkable pilgrimage from China to Jerusalem.