Trinitarians often claim that trinitarians do not believe in a "three-headed trinity". While it may be true that most trinitarians would not think of the trinity in those terms, yet, in history, many trinitarian artists did depict the alleged triune God with three heads. I am providing some links below that confirm this:
(1) Abraham and the Trinity, (c.1270-80) inserted at the front of a fourteenth-century Psalter (English). It is claimed that this is a "Biblical" illustration, although the Bible itself never once presents the God of Abraham as being three persons. Indeed, the Bible only presents the God of Abraham as being one individual or person. -- Exodus 3:14,15; Deuteronomy 18:15-20; Acts 3:13-26.
(2) The Three Headed Trinity, (c1260) Salisbury Cathedral.
(3) Three-Faced Trinity, (c1750-70), Peru (Canvas painting)
(4) Trinity_by_Jeronimo_Cosida (c1570) From Cistercian Monastery of Tulebras, Navarra, Spain.
(5) Three-Faced Trinity (unidentified)
If anyone knows of more, please leave a comment below.
Evidently, there have been trinitarian artists who interpreted the idea of "three persons in the Godhead" to mean three persons, three heads, that make up the trinitarian idea of the Godhead.