 After the death of Constantine I in 337 and the accession of his Arian-leaning son Constantius II, open discussion of replacing the Nicene creed itself began.Up until about 360, theological debates mainly dealt with the divinity of the Son, the second person of the Trinity.However, because the Council of Nicaea had not clarified the divinity of the Holy Spirit, the third person of the Trinity, it became a topic of debate.