Frederick I, Duke of Athens

Frederick I of Athens ( Frederick I of Sicily, * 1340, † July 11, 1355 in Messina) was Margrave of Randazzo and Duke of Athens and Neopatria. He was a son of Duke John II and the Cesarina Lancia.

Friedrich never entered his Greek Duchy; for him ruled vicars used. During this time, Athens was involved as an ally of Venice in a war against Genoa for supremacy in the Aegean. Moreover, the country was plagued by constant raids of Turkish pirates, making it more feral. Likewise, fell into this time, the first land invasions of the Turkish Ottomans on European soil.

Like his father died of the plague Friedrich. Because he had no heirs, next of kin of followed him from the Sicilian Royalty, King Frederick III. Although itself in 1388 in Athens, the Florentine family Acciaiuoli had forcibly assumed power, kept the kings of Sicily on to their claims. Since the Kingdom of Sicily was united in 1412 in personal union with the Kingdom of Aragon and the Kingdom of Spain this came up, the title of Duke of Athens and Neopatria found its way into the Spanish royal titulary in which it is included today.