E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Cavas traitor sire. Cava or Florinda was the daughter of St. Julian. It was the violation of Cava by Roderick that brought about the war between the Goths and the Moors. St. Julian, to avenge his daughter, turned traitor to Roderick, and induced the Moors to invade Spain. King Roderick was slain \??\ Xerës on the third day. (A.D. 711.)