"The Houthis are members of a rebel group, also known as Ansar Allah (Partisans of God), who adhere to a branch of Shia Islam known as Zaidism. Zaidis make up one-third of the population and ruled North Yemen under a system known as the imamate for almost 1,000 years until 1962. The Houthis take their name from Hussein Badr al-Din al-Houthi. He led the group's first uprising in 2004 in an effort to win greater autonomy for their heartland of Saada province, and also to protect Zaidi religious and cultural traditions from perceived encroachment by Sunni Islamists." BBC News, Yemen crisis: Who is fighting whom?