Did Constantine Really Say It Was "Unworthy" to Follow the Yahudi Practice for Pasakh?
After Nicaea (325 CE) · Emperor: Constantine · Preserved: Eusebius, Life of Constantine 3.17–20 (esp. 3.18)
What the ancient record says
Yes, not merely a later accusation; Eusebius preserves a letter attributed directly to Constantine, addressed to assemblies after Nicaea, discussing the Pasakh dispute. Constantine says it appeared "an unworthy thing" to follow the practice of the Yahudim in determining the observance.
Goal: uniformity, kept by everyone, everywhere, on the same day. The controversy (cards 51–56) existed long before Constantine, but now an emperor was involved, moving it from disputes among assembly leaders into imperial authority.
He did not invent the disagreement, Eusebius (Life of Constantine 3.5) admits it existed for a long time. Evidence gives: disagreement before Constantine, then Nicaea, then Constantine pressing for empire-wide uniformity.
The defensible question is not "did Constantine invent Pasakh?" but "what happened when an emperor used his position to support one side of an existing dispute?"
Read it for yourself. Eusebius, Life of Constantine 3.17–20 (esp. Ch. 18).
Evidence strength: Very strong ancient documentary testimony. Attested: he demanded uniformity, called following Yahudi practice unworthy, advocated abandoning it. Not established: he originated the earlier disagreement.