The Kingdom of Jerusalem was a medieval state established in 1099 during the First Crusade. It was located in the region of the Levant, primarily encompassing parts of modern-day Israel and Palestine. The kingdom was founded by European crusaders who aimed to reclaim the Holy Land from Muslim control. Its capital was the city of Jerusalem, which held significant religious importance for Christians. The kingdom experienced periods of prosperity and conflict, often facing challenges from surrounding Muslim states. It existed until 1291 when the last stronghold, Acre, fell to the Mamluks. The Kingdom of Jerusalem played a crucial role in the history of the Crusades and the interactions between Christians and Muslims.