Ibn Mubarak is credited in an inscription with the completion of the castle of Masyaf, an Assassin stronghold in Syria. Another man, known as Qusta is mentioned as having worked at the castle in 550/1155. See also: Stone-cutter; Mason; Carpenter.
Citation: Mayer, Leo Ary, Islamic Architects and their Works (Geneva: Albert Kundig, 1956), pp. 70, 116.