Shaykh Ahmad b. Zayn ad-Dín b. Ibráhím al-Ahsá'í (1753 - 1826) was the founder of a 19th century Shi`i school in the Persian and Ottoman empires, whose followers are known as Shaykhís. He was a native of the Al-Ahsa region (Eastern Arabian Peninsula), educated in Bahrain and the theological centers of Najaf and Karbala in Iraq. Spending the last twenty years of his life in Iran, he received the protection and patronage of princes of the Qajar dynasty. Wikipedia
The definitive Wikipedia entry for Shaykh Ahmad. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Shaykh_Ahmad
