

1226 – The first recorded instance of the Catholic practice of perpetual Eucharistic adoration formally begins in Avignon, France.1180 – Genpei War: Battle of Ishibashiyama in Japan.919 – Battle of Islandbridge: High King Niall Glúndub is killed while leading an Irish coalition against the Vikings of Uí Ímair, led by King Sitric Cáech.786 – "Night of the three Caliphs": Harun al-Rashid becomes the Abbasid caliph upon the death of his brother al-Hadi.629 – Emperor Heraclius enters Constantinople in triumph after his victory over the Persian Empire.AD 81 – Domitian becomes Emperor of the Roman Empire upon the death of his brother Titus.September 14 is the 257th day of the year (258th in leap years) in the Gregorian calendar 108 days remain until the end of the year.
