Petrus Alphonsi

Not to be confused with Pedro Alfonso or Pedro Afonso.
Pedro Alfonso/Petrus Alphonsi in a 15th-century imagined portrait
Petrus Alfonsi's Tetragrammaton-Trinity diagram, which influenced Joachim of Fiore and the development of the Shield of the Trinity diagram

Petrus Alphonsi (died after 1116) was a Spanish physician, writer, astronomer and polemicist who was born and raised as a Jew and later in life converted to Christianity in 1106. He is also known just as Alphonsi,[1] and as Peter Alfonsi or Peter Alphonso, and was born Moses Sephardi. Born in Islamic Spain, he mostly lived in England and France after his conversion.

  1. ^ Tolan, xv