المؤتمر السوري
Al-Hassan represented the Euphrates region at the Syrian National Congress held in late June 1919, which proclaimed the independence of Syria and establishment of the Syrian Arab Kingdom on 8 March 1920, and appointed Faisal bin Sharif Hussein as a king. Al-Hassan participated in the coronation of Faisal as king of Iraq on 23 August 1921 and supported his inauguration.