Ephrem the Syrian
A number of Church Fathers of the 4th and 5th centuries explicitly speak of the Holy Spirit as proceeding "from the Father and the Son". They include Hilary of Poitiers (c. 300 – c. 368), Ephrem the Syrian (c. 306 – 373), Epiphanius of Salamis(c. 310–320 – 403), Ambrose (337–340 – 397),