Pope Leo II begins his pontificate.

Pope Leo II was the Bishop of Rome from 17 August 682 to his death on 28 June 683. One of the popes of the Byzantine Papacy, he is described by a contemporary biographer as both just and learned. He is commemorated as a saint in the Roman Martyrology.

August 17 is the 229th day of the year in the Gregorian calendar; 136 days remain until the end of the year.