As mentioned earlier, Shiites after Sunnis constitute the largest population among Muslims. Iran has the most Shiea Muslims. The first center of Shiea religious education in Iran (Qom). After Iran, Iraq, then Yemen (mainly Shia Zaidiyeh) then other countries like Azerbaijan – Lebanon – Bahrain – Saudi Arabia – Pakistan – Afghanistan – Turkey – Syria (Alavi Shiite).
Iran was the only Shiite country in recent centuries, and so most Shiite scholars were Iranian, both in Iran and elsewhere.