Lewis Short
rēgĭ-fŭgĭum (noun N) : rex-fuga, the king's flight
* A festival celebrated on the 24th of February, to commemorate the expulsion of the kings, Aus. Ecl. Fer. Rom. 13; Fest. p. 278 Müll.; Paul. ex Fest. p. 279 ib.; Kalend. Maff. ap. Orell. Inscr. II. p. 384; called regis fuga,Ov. F. 2, 685.
Charlton T. Lewis, Charles Short, A Latin Dictionary