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"Ember days (corruption from Lat. Quatuor Tempora, four times) are the days
at the beginning of the seasons ordered by the Church as days of fast and
abstinence. They were definitely arranged and prescribed for the entire
Church by Pope Gregory VII (1073-1085) for the Wednesday, Friday, and
Saturday after 13 December (S. Lucia), after Ash Wednesday, after
Whitsunday, and after 14 September (Exaltation of the Cross). The purpose of
their introduction, besides the general one intended by all prayer and
fasting, was to thank God for the gifts of nature, to teach men to make use
of them in moderation, and to assist the needy...."

I'll check for more authoritative sources.

I hope that helps,

Matheus de Troyes/Brian Songy