Fayruz al-Daylami

Abū ʿAbd Allāh Fayrūz al-Daylamī al-Himyarī (, Persian: فیروز دیلمی, Firuz the Daylamite) was a Persian companion of the Islamic prophet Muhammad. He had two wives who were sisters. As a result of his conversion to Islam, he divorced one wife on the order of the Islamic prophet Muhammad, since a Muslim cannot simultaneously have as wives two women who are biological sisters.

Later, in 632, after Aswad Ansi claimed prophethood in Yemen and proceeded to invade Najran and much of Yemen—attacking Sanaa and killing the ruler of Yemen, Shahr, son of Badhan—Fayruz was sent by Muhammad to kill Aswad. In al-Tabari's History, Muhammad is reported as saying, "He was killed by the virtuous man Fayruz al-Daylami." However, some sources mention that he governed the region of Sanaa and died later, in 673, during the reign of Mu'awiya I.