Chlemoutsi is located in the village of Kastro in the Municipality of Kyllini (Ilia), on the westernmost cape of the Peloponnese. it is built on the top of a hill that dominates the plain of Ilia. The castle was founded in 1220-1223 by the sovereign Godfrey I Villehardouin. Built-in a strategic position, with an extensive view of the plain of Ilia and the Ionian Sea, it protected the capital of the principality of Andravida and the important port of Glarentza.
Today, the castle remains one of the most important and well-preserved fortresses in Greece and is an excellent sample of the fortress architecture of the Frankish era in the Peloponnese.