 Its history is divided into two distinct periods.The First Kingdom of Jerusalem lasted from 1099 to 1187, when it was almost entirely overrun by Saladin.After the subsequent Third Crusade, the kingdom was re-established in Acre in 1192, and lasted until that city's destruction in 1291, except for the two decades after Frederick II of Hohenstaufen reclaimed Jerusalem, placing it back in Christian hands after the Sixth Crusade.