1) Lake of Lazio 
Regillus was an ancient lake of Latium, Italy, famous in the legendary history of Rome as the lake in the neighborhood of which occurred (496 B.C.) the battle which finally decided the hegemony of Rome in Latium. During the battle, so runs the story, the dictator Postumius{dn|date=December 2013} vowed a temple to Castor and Pollux, who were specia...