Did the Council of Antioch Later Threaten People Who Observed Pasakh with the Yahudim?
Council: Antioch, 341 CE · Evidence: Canon 1
What the ancient record says
A different era, the 2nd-century dispute lacked Roman imperial religious machinery; by the 4th century that changed. Antioch Canon 1 explicitly addresses the Pasakh decision associated with Nicaea and orders conformity: it condemns those who reject the Nicene determination, and specifically addresses leaders who continue observing Pasakh with the Yahudim.
Penalty severe, ordinary members: exclusion; leaders: removal from office and separation from the assembly. Not just "we prefer another date", institutional discipline with penalties for nonconformity.
Antioch did not invent the controversy (cards 51–56 show it was older); it represents a later stage: earlier disagreement, then formal canonical enforcement. The canon itself does not establish execution, do not upgrade excommunication/deposition into a death penalty; report the penalties the canon states.
Read it for yourself. Council of Antioch, Canon 1 (the provision on observing Pasakh with the Yahudim).
Evidence strength: Direct canonical evidence.