Sanaa, also spelled Sanaʽa or Sana, is the largest city in Yemen and the centre of Sanaa Governorate. The city is not part of the Governorate, but forms the separate administrative district of "Amanat Al-Asemah". Under the Yemeni constitution, Sanaʽa is the capital of the country, although the seat of the internationally recognised government moved to Aden in the aftermath of the September 21 Revolution. Aden was declared as the temporary capital by President Abdrabbuh Mansur Hadi in March 2015.