Context: The Vultus Trifrons, or Trifacial Trinity, was a bizarre type of Christian iconography that first appeared in the 12th century. It took the Holy Trinity and grotesquely depicted it as a singular figure (typically Jesus) with three faces merged together To symbolize the Father, Son and Holy Spirit in one entity. This depiction would be banned by Urban VIII in 1628, as it was considered heretical, too reminiscent of pagan depiction of gods, and generally disturbing to look at.
A Vultus Trifrons:
https://templarkey.com/three-faced-god-forbidden-image-holy-trinity/