[Loch-Ruadh] OT - homework help - mythology

[Madelina de Lindesay]

Greetings!

I've exhausted myself trying to find an answer to my niece's homework question:  What (if any) is the Roman equivalent of Leda (of swan fame)?  I've found out she is the mother of Helen, Castor, and Pollox, but other than that, I've run in circles.

Anyone with a clue who can answer before 8 a.m. Thursday, please do.

Regards,
Madelina