Battle of Karydi

War of the Euboeote Succession
Map of the Byzantine Empire and Latin Romania in 1265
Date 1256–1258 Location Euboea, Central Greece, Peloponnese Result Achaean victory
Belligerents
Principality of Achaea  Republic of Genoa	Republic of Venice Lordship of Athens and Thebes Triarchs of Negroponte Lordship of Salona Marquisate of Bodonitsa
Commanders and leaders
William II of Villehardouin	Paolo Gradenigo Guy I de la Roche

The War of the Euboeote Succession was fought in 1256–1258 between the Prince of Achaea, William II of Villehardouin, and a broad coalition of other rulers from throughout Frankish Greece who felt threatened by William's aspirations. The war was sparked by William's attempt to gain control of a third of the island of Euboea, which was resisted by the local Lombard barons ("terciers" or "triarchs") with the aid of the Republic of Venice. The Lord of Athens and Thebes, Guy I de la Roche, also entered the war against William, along with other barons of Central Greece. Their defeat at the Battle of Karydi in May/June 1258 effectively brought the war to an end in an Achaean victory, although a definite peace treaty was not concluded until 1262.

Following the Fourth Crusade, southern Greece had been divided among several Latin lordships, the most powerful of which was the Principality of Achaea, which controlled the entire Peloponnese peninsula. William II of Villehardouin, who in 1246 had succeeded his elder brother as prince, was a most energetic ruler, who aimed to expand and consolidate his rule over the other Latin states.Guy I de la Roche, the "Great Lord" of Athens and Thebes, was already his vassal for the fief of Argos and Nauplia, which lay in the Peloponnese, and William was also suzerain of the three Lombard baronies (terzieri, "thirds") of Negroponte (the medieval name of both the island of Euboea and its capital, modern Chalkis).

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