Abi Mekhnaf (Yahya ibn Sa'id ibn Mikhnaf Al-Kufi) was a Muslim historian from the 8th century. He lived in Kufa and died in http://www.sicm.org.uk/knowledge/Kitab%20Maqtal%20al-Husayn.pdf Kitab Maqtal al-Husayn, tranlators' forward. He attributes to Shiism by some Rijal scholars but it's doubtful and not accepted with all of them.