The "Kings of Jerusalem" refers to the rulers of the city of Jerusalem during various historical periods, particularly during the Crusades. The most notable kings were part of the Kingdom of Jerusalem, established in 1099 after the First Crusade. This kingdom was a Christian state in the Holy Land, and its kings played crucial roles in the conflicts between Christians and Muslims. The first king was Baldwin I, who established the monarchy and expanded its territory. Subsequent kings, such as Baldwin IV, known as the "Leper King," faced challenges from Muslim leaders like Saladin. The kingdom eventually fell to Muslim forces in 1291, marking the end of Christian rule in Jerusalem.