John of Ibelin (c. 1179 – 1236), called the Old Lord of Beirut, was a powerful crusader noble in the 13th century, one of the best known representatives of the influential Ibelin family. The son of Balian of Ibelin and Maria Comnena, Queen consort of Jerusalem, he had close ties with the nobility of both Cyprus and Jerusalem, since he was the half-brother of Queen Isabella I of Jerusalem. Before he was 20, he was appointed constable of Jerusalem, and a few years later became lord of Beirut, where he rebuilt the city after Saladin's conquest, and established the grand Ibelin family palace. He served as regent for two of his young relatives, Isabella's daughter Maria of Montferrat from 1205 to 1210, and then Henry I of Cyprus from 1228 until Henry came of age in 1232. John was known as a pri