Egg Saturday, Egg Feast, or Festum Ovorum is the Saturday before Ash Wednesday.Robert E. Brettle, John Marston, Dramatist at Oxford, 1591 (?)–1594, 1609. The Review of English Studies, Volume 3, Number 12, pages 398–405, October 1927. Oxford University Press. Oxford English Dictionary: Egg-Saturday

At the University of Oxford, pasch eggs have been provided to students on that day.

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