Origen had a teacher named Ammonius and so did Plotinus, and for seventeen centuries nobody has been able to say for certain whether that is one sentence or two. Porphyry, writing against the Christians, said that Ammonius was born of Christian parents and turned to paganism as soon as he began to think for himself — the point being that Origen went the other way and was therefore the odd one out. Eusebius quotes him in order to call him a liar: Ammonius, he says, held the divine philosophy unshaken to the end of his life, and his books prove it, above all the one entitled The Harmony of Moses and Jesus. Jerome follows Eusebius. The usual modern settlement, and the one the notes to the translation this project ships adopt, is that there were two men of the same name in the same city — the Neoplatonist who taught Plotinus, Herennius, Longinus and the pagan Origen, and the Christian who taught the Christian Origen and wrote the Harmony. Wikidata keeps two items and this dataset keeps both of them, joined by an identity row rather than merged, because merging would decide a question that is still open. Until this seed the two pages displayed the same name, which decided it by accident.
Ecclesiastical History · HE 6.19.6-10