Saudis (Arabic: سعوديون Suʿūdiyyūn) or Saudi Arabians are a nation composed mainly of Arab ethnic groups who are native to the Arabian Peninsula and live in the five historical Regions: Najd, Al-Hijaz, Asir, Tihama and Al-Ahsa; the regions which Kingdom of Saudi Arabia was founded on or what was formerly known as the Kingdom of Hejaz and Nejd in the Arabian Peninsula. Saudis speak one of the accents and dialects of the Peninsular Arabic, including the Hejazi, Najdi, Gulf and Southern Arabic dialects (which includes Bareqi), as a mother tongue. According to the 2010 A. D. census, Saudi nationals represented approximately 19,335,377 making up 74. 1% of the total population. Saudi Arabia is a state governed by absolute monarchy, with the king as its head of state. The word Saudis refer to the name of the ruling family in the Kingdom of Saudi Arabia today as an inclusive name for the people of the five regions: (Najd, Al-Hijaz, Asir, Tihama, and Al-Ahsa).