May – Constantine III, age 29, dies of tuberculosis after a four-month reign, leaving his half-brother Heraklonas sole emperor. Rumors spread that Constantine has been poisoned by Heraclius's second wife (and niece) Martina.
Constans II establishes a new civil-military defensive organisation, based upon geographical military district. Byzantine forces maintain the frontier along the line of the Taurus Mountains (Southern Turkey).
Emperor Taizong of the Tang dynasty issues a decree throughout China, that increases the punishment for men who deliberately inflict injuries upon themselves (most commonly breaking their own legs) in order to avoid military conscription. This decree is an effort to eradicate this practice that has grown as a trend since the time of the rebellion against the Sui Dynasty.
Chinese prefectural government officials travel to the capital of Chang'an, to give the annual report of the affairs in their districts. Emperor Taizong discovers that many have no proper quarters to rest in, and are renting rooms with merchants. Therefore, Taizong orders the government agencies in charge of municipal construction to build every visiting official his own private mansion in the capital.
Taizong commissions artist Yan Liben to paint in the Lingyan Pavilion the life-size portraits of 24 government officials, to commemorate their service and contributions to the founding of the Tang Dynasty.
Valentinus, Byzantine general, attempts to usurp the throne of his son-in-law Constans II. He appears at the gates of Constantinople with a contingent of Byzantine troops, and demands to be crowned emperor. His claim is rejected, and Valentinus is lynched by the populace.
Self-proclaimed emperor Gregory the Patrician is killed during the Arab invasion at Sufetula. Africa returns to imperial allegiance after his death, but the foundation of Byzantine rule is fatally undermined.
Emperor Constans II, to quiet the intense controversy caused by the Monothelete doctrine, issues an imperial edict forbidding the subject to be discussed. This edict, distributed by patriarch Paul II in Constans' name, is known as the Typos.