King Abdullah bin Abdulaziz Al Saud has passed away after almost 20 years of as ruler of the oil-rich Saudi Arabia.

King Abdullah first acted as de-facto ruler in 1996 as a result of his half brother King Fahd suffering a debilitating stroke. He became the reigning monarch in 2005.

King Abdullah was the 13th of 37 sons of the founder of the Saudi Arabian Kingdom, Ibn Saud, and was the sixth Saudi King since the creation of the state.

As the Saudi Arabian throne passes from brother to brother as opposed to father to son, King Abdullah’s younger half brother, Crown Prince Salman is set to succeed him.