In 1932, Saudi Arabia was created by the combination of the Hejazi Kingdom and the Sultanate of Nejd. After its creation, Saudi Arabia used a bimetallic monetary system based on British gold sovereigns and silver riyals. In 1952, the monetary system was reformed to use a single currency. This currency, the Saudi riyal, was backed by Saudi gold guineas equivalent to the British gold sovereign until 1959, when a system based on fiat money issued by the Saudi Arabian Monetary Agency was created.