The Order of Assassins was a Nizari Isma'ili Shia Islamic military order founded by Hasan-i Sabbah in 1090. Based in the Nizari Isma'ili state, which comprised a network of mountain castles in Persia and Syria, they conducted several high-profile assassinations throughout the Levant during the Crusades. The Assassins held a strict subterfuge policy in the region and are believed to have killed hundreds of people who were deemed enemies of their state over the course of 200 years, including other Shias, as well as Sunnis and Christians alike.