Colin was born in Roman Britain, but his true surname, which is never given, was not MacLeod at birth. One of the flashback scenes shows him achieving this honor after he fought alongside Clan MacLeod in an unknown battle, presumably because Octavius was fighting for the opposition. The Clansmen honor Colin, and name him a MacLeod for giving his life for their cause. Once he regains life, as all Immortals do, Colin adopts the name, and keeps it for the rest of his life, as it was with the MacLeods that Colin learned the values that would one day assist him in overcoming his unyielding lust for vengeance.