The Síyáh-Chál was a subterrenean dungeon southeast of the palace of the Sháh in Tehran. It carries a significant role in the history of the Baháʼí Faith, because its founder, Baháʼu'lláh was held there for four months in 1852, and it is where he claimed to have received a revelation. The Síyáh-Chál is regarded as the second holiest place in Iran to Baháʼís, after the house of the Báb, in Shiraz.