Leukas, called Lefkada in ancient times, was joined to the mainland of Greece, and was therefore not actually an island, before the Corinthian colonists cut it. From this coin, it’s clear that Leukas was originally a Corinthian colony, since both the obverse and reverse of the coins are nearly the same.
Recently, there’s been some theories that Leukas was the home of Odysseus and not Ithaca. Kefalonia also makes this claim, though their argument is much stronger. In the case of Leukas, the main case is a sentence in The Odyssey that states Ithaca was reachable on foot, which is possible for Leukas but not for Ithaca.
Leukas was on the side of Sparta in the Peloponnesian War.