In the spring of 1415, he and his soldiers left for the Peloponnese, arriving at the little port of Kenchreai on Good Friday, 29 March. Manuel II Palaiologos used his time there to bolster the defences of the Despotate of Morea, where the Byzantine Empire was actually expanding at the expense of the remnants of the Latin Empire. Here Manuel supervised the building of the "Hexamilion" (six-mile wall) across the Isthmus of Corinth, intended to defend the Peloponnese from the Ottomans.