E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
(Latin feri, holidays.)
A day after the fair. Too late for the fun. Sero sapiunt Phryges. The Phrygians were noted for their obstinacy; hence, Phryx verberatus melior. They were thrice conquered: by Hercules, the Greeks, and the Latins, and were wise after the events.