SC - Friday Feasts

[Jill James]

If you all would be so kind as to consider this question: In England of
the thirteenth/fourteenth century, a meatless Friday fast was followed,
right?  If this is true, then when a major feast day (say Michelmas)
fell on a Friday, would meat be cooked as in a feast on any other day,
or would the cook have to prepare food of fish or the "white meats"? 
Thank you all very much for a lively and informative list.

Jill, lurker and first time poster