Ali al-Hadi, the tenth Imam of Shia Islam (born 829)

Ali al-Hadi was a descendant of the Islamic prophet Muhammad and the tenth Imam in Twelver Shia, succeeding his father, Muhammad al-Jawad. Born in Medina in 828, Ali is known with the titles al-Hādī and al-Naqī. After the death of his father in 835, most followers of al-Jawad readily accepted the imamate of Ali, who was still a child at the time. Drawing parallels with the story of young Jesus in the Quran, Twelver sources attribute an exceptional innate knowledge to Ali which qualified him for the imamate despite his young age.

June 21 is the 172nd day of the year in the Gregorian calendar; 193 days remain until the end of the year.