Guilielmus of Tyre was a medieval historian and cleric, born around 1130 in Tyre, a city in present-day Lebanon. He is best known for his work, "Historia rerum in partibus transmarinis gestarum," which chronicles the history of the Crusades and the Latin East. His writings provide valuable insights into the political and social dynamics of the time. As a member of the Latin Church, Guilielmus served as the archbishop of Tyre and was involved in the administration of the Kingdom of Jerusalem. His historical accounts are considered significant for understanding the interactions between Christians and Muslims during the Crusades, as well as the cultural exchanges that occurred in the region.