Question: What was officially initiated by Sherif Hussein bin Ali at Mecca on 10 June 1916, and was part of the Siege of Medina that occurred during World War I?
Sentence (from "Faisal I of Iraq"): He was the third son of Hussein bin Ali, the Grand Sharif of Mecca, who had proclaimed himself King of the Arab lands in October 1916.
Relevant evidence: No