What is flag of the kingdom of jerusalem?

The flag of the Kingdom of Jerusalem is a red cross on a white background, known as the Cross of Jerusalem. This flag was used by the Crusaders and was adopted as the emblem of the Kingdom of Jerusalem during the 12th century. The Cross of Jerusalem consists of four small crosses inside a large cross, representing the four Gospels of the Bible. The flag was used until the fall of the Kingdom of Jerusalem in 1291. Today, it is still used as a symbol of the historic Crusader Kingdom.