Fayruz al-Daylami

Fayruz al-Daylami (Arabic: فيروز الديلمي‎‎, Fayruz the Daylamite) was a Persian companion of the Islamic prophet Muhammad. He belonged to the descendants (abna) of Persians that had been sent by Khusraw Anooshiravan to Yemen, conquered it, and drove out the Abyssinians.

After Aswad Ansi claimed prophethood in Yemen, proceeded to invade Najran and much of Yemen, attacking Sana'a and the ruler of Yemen and Shahr, who along with the son of Badhan was killed in battle against Aswad, Fayruz was sent out by the Prophet Muhammad to kill him. In reference to this, in al-Tabari's History, Muhammad was reported as saying, "He was killed by the virtuous man Fayruz b. al-Daylami." Fayruz died during the caliphate of Uthman.

He was reported to have killed Musaylimah, a false prophet.