Latʹeran
.The ancient palace of the Lateraʹni, given by the Emperor Constantine to the popes. Lateran, from lateo, to hide, and rana, a frog. It is said that Nero … on one occasion vomited a frog covered with blood, which he believed to be his own progeny, and had it hidden in a vault. The palace which was built on the site of this vault was called the “Lateran,” or the palace of the hidden frog. (Buckle: History of Civilisation.)