Constans II orders Olympius, exarch of the Exarchate of Ravenna, to arrest Pope Martin I on the ostensible grounds that the pope's election has not been submitted to the emperor for approval, but in fact because of the Lateran Council of 649's condemnation of Monothelitism and the Type of Constans. Olympius attempts to gain the support of the citizens of Rome and the bishops, with little success, and perhaps considers the assassination of the Pope.
June 16 – General Wang Xuance commands a combined Chinese, Nepalese, and Tibetan expedition into India. He ends up winning the battle and acquiring a Buddhist relic.[3]
July 10 – Emperor Taizong dies after a 23-year reign, in which he has restored the civil administration in China. He is succeeded by his son Gaozong, age 20, who becomes ruler of the Tang dynasty.