Portal:Religion/On this day/May 18
- 1268 - The Principality of Antioch, a crusader state, falls to the Mamluk Sultan Baibars in the Battle of Antioch; Baibars' destruction of the city of Antioch was so great as to permanently negate the city's importance.
- 1593 - Playwright Thomas Kyd's accusations of heresy lead to an arrest warrant for Christopher Marlowe.