Sayyid Amir Ahmad ibn Musa al-Kazim, son of the seventh Imam Musa al-Kazim and brother of the eighth Imam Ali al-Rida. Known as 'Shah Cheragh' (King of the Light); martyred in Shiraz. His shrine, famous for its mirror-mosaic interior, is among Iran's most important Shia sites. (Sources: Encyclopaedia Britannica; Wikidata Q1957722. Note: the 835/1431 date in some sources is erroneous; he was a contemporary of Imam Reza.)