Editing 638 (section)

=== 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]] &ndash; Year 0 of the [[Burmese calendar]], based on the [[Buddhist calendar|Chula Sakarat]], is also used in the [[Indochina|mainland of Southeast Asia]].

==== Religion ====
* [[October 12]] &ndash; [[Pope Honorius I]] dies at [[Rome]] after a 13-year reign, and is succeeded by [[Pope Severinus|Severinus]], but the Byzantine emperor Heraclius will delay the new pope's [[consecration]] until May [[640]]. 
* [[December 20]] &ndash; [[Patriarch Pyrrhus of Constantinople|Pyrrhus I]] becomes [[Ecumenical Patriarch of Constantinople|patriarch of Constantinople]], after the death of [[Sergius I of Constantinople|Sergius I]]. He has been an advocate of [[Monothelitism]] and a close friend of Heraclius.</onlyinclude>