E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The Severn. In Miltons Comus we are told she is the daughter of Locrine that had the sceptre from his father, Brute, and was living in concubinage with Estrildis. His queen, Guendolen, vowed vengeance against Estrildis and her daughter, gathered an army together, and overthrew Locrine by the river Sture. Sabrina fled and jumped into the river. Nereus took pity on her, and made her goddess of the Severn. which is poetically called Sabrina.