In 1206, King
Hugh I of Cyprus nominated Walter constable, a post he held for the rest of his life. This was also the title Walter preferred when witnessing charters. Walter inherited the lordship of Caesarea on the death of his mother between 1213 and 1216, when the first reference to him as lord appears. In January 1217 he was in
Acre at the court of the king,
John of Brienne. By July he had returned to
Nicosia, in Cyprus, where he witnessed a charter of
Bertrand of Margat. In September he was at the royal court at Nicosia. He returned to the mainland in October, when he attended the council held at Acre by King
Andrew II of Hungary to decide a course of action for the
Fifth Crusade. As constable, Walter led 100 Cypriot knights at the
Siege of Damietta in 1218. By July he had returned to Nicosia, where the dowager queen,
Alice, was regent for the new infant king,
Henry I. In 1220, the Muslims returned under
al-Mu'azzam and captured the city, which was being defended by
Werner von Egisheim and the
Republic of Genoa. In 1220, Walter was in Nicosia at the court of Queen Alice, where he witnessed a charter of hers. In 1225, he was in
Tyre for the coronation of Queen
Isabella II of Jerusalem. ==Breakout of civil war and the Sixth Crusade==