Events

By Place

• Oswald of Northumbria defeats Cadwallon ap Cadfan of Gwynedd in the Battle of Heavenfield and reunites Northumbria.

Asia

• The Rashidun Caliphate starts the Islamic conquest of the Byzantine empire.
• September 20 — Khalid Ibn Walid captures Damascus.
• The Xianbei/Tibetan state of Tuyuhun is invaded by Tang Dynasty China during Emperor Taizong's campaign against Tuyuhun, led by commander Li Jing, resulting in the assassination of their leader (Busabuo Khan Murong Fuyun) in 635 and the dissolving of their state in 672.

By Topic

Religion

• Umar ibn al-Khattab succeeds Abu Bakr as Sunni Caliph.

Births

Lester M. Maximillian III - Salesman

Deaths

• August 23 — Abu Bakr, first Sunni Caliph
• Cadwallon ap Cadfan, king of Gwynedd