On This Day: June 26th

Western Schism: The Roman Catholic Church is led into a double schism as Petros Philargos is crowned Pope Alexander V after the Council of Pisa, joining Pope Gregory XII in Rome and Pope Benedict XIII in Avignon.

Ulrich von Jungingen becomes Grand Master of the Teutonic Knights.

Przemysł II crowned king of Poland, following Ducal period. The white eagle is added to the Polish coat of arms.

Mongols under Baiju Noyan defeat the Seljuk Turks under Kaykhusraw II at the Battle of Köse Dağ. The Sultanate of Rum becomes subsequently a vassal to the Mongol Empire.

Election of pope Innocent IV following the death of pope Celestine IV in 1241.

En no Ozuno, a Japanese mystic and apothecary who will later be regarded as the founder of a folk religion Shugendō, is banished to Izu Ōshima.

Pope Benedict II is consecrated as pope following imperial approval from the Byzantine Emperor. He is the last pope to require the confirmation of the emperor, the next popes require only that of the more closely situated exarch of Ravenna.

Roman emperor Julian is fatally wounded by Sassanid troops in a skirmish close to Samarra while retreating from his failed siege of Ctesiphon.

Roman emperor Elagabalus adopts his cousin Alexander Severus as his heir and grants him the title of Caesar.

Augustus adopts Tiberius.