Leil was a legendary king of the Britons as accounted by Geoffrey ofMonmouth. He was the son of King Brutus Greenshield.
Leil was a peaceful and just king and took advantage of the prosperityafforded him by his ancestors. He built Kaerleil (City of Leil) in thenorth as a tribute to this prosperity. He reigned for twenty-five yearsuntil he grew old and feeble. His inactivity sparked a civil war, duringwhich he died. He was succeeded by his son Rud Hud Hudibras.
It is said that Leil reigned at the time when Solomon built the Temple inJerusalem and Silvus Epitus was king of Alba Longa.