The Caelian Hill (; ; ) is one of the famous Seven Hills of Rome. Under reign of Tullus Hostilius, the entire population of Alba Longa was forcibly resettled on the Caelian Hill. According to a tradition recounted by Titus Livy, the hill received its name from Caelius Vibenna, either because he established a settlement there or because his friend Servius Tullius wished to honor him after his death.