June 18 is the 169th day of the year (170th in leap years) in the Gregorian calendar; 196 days remain until the end of the year. == Events == === Pre-1600 === 618 – Li Yuan becomes Emperor Gaozu of Tang, initiating three centuries of Tang dynasty rule over China. 656 – Ali becomes Caliph of the Rashidun Caliphate. 860 – Byzantine–Rus' War: A fleet of about 200 Rus' vessels sails into the Bosphorus and starts pillaging the suburbs of the Byzantine capital Constantinople. 1053 – Battle of Civ…