the Hajj (pilgrimage). Asia The Tibetan Empire, seeking an alliance through marriage with Tang dynasty China, launches an attack on Songzhou that is repelled by Chinese forces, but is followed by the marriage of the Chinese Princess Wencheng to Tibetan ruler Songtsän Gampo. By topic Arts and sciences The Islamic calendar is introduced by Abu Musa al-Asha'ari. He convinces Umar I to make notes of an era for Muslims. March 22 – Year 0 of the Burmese calendar, based on the Chula Sakarat, is also used in the mainland of Southeast Asia. Religion October 12 – Pope Honorius I dies at Rome after a 13-year reign, and is succeeded by Severinus, but the Byzantine emperor Heraclius will delay the new pope's consecration until May 640. December 20 – Pyrrhus I becomes patriarch of Constantinople, after the death of Sergius I. He has been an advocate of Monothelitism and a close friend of Heraclius. Births Huineng, Chinese Zen Buddhist patriarch of the Tang dynasty (d. 713) Deaths March 11 – Sophronius, patriarch of Jerusalem October 12 – Pope Honorius I December 9 – Sergius I, patriarch of Constantinople Qin Shubao, general of the Tang dynasty Yu Shinan, calligrapher and official (b. 558) References Sources