Europe · High and late Middle Ages
Principality of Achaea
1205–1432/1460s
The premier Frankish state in Greece, in the Morea (Peloponnese), founded 1205 by William of Champlitte and Geoffrey I of Villehardouin after victory at the Battle of the Olive Grove of Koundouros. Geoffrey I secured the principality for himself through legal maneuvering (the "year and a day" ploy, with Venetian help delaying his rival Robert of Champlitte) and became prince (to 1219).
- Existed
- 1205–1432/1460s
- Shown on the map
- 1206–1278, 1294–1325, 1385–1439 (3 periods)
- Peak area
- 20k km²
- Region
- Europe
Foundation
The premier Frankish state in Greece, in the Morea (Peloponnese), founded 1205 by William of Champlitte and Geoffrey I of Villehardouin after victory at the Battle of the Olive Grove of Koundouros. Geoffrey I secured the principality for himself through legal maneuvering (the "year and a day" ploy, with Venetian help delaying his rival Robert of Champlitte) and became prince (to 1219). Capital at Andravida; other centers at Glarentza and (from the mid-13th century) the great fortress of Clermont/Chlemoutsi.
Institutions and the Assizes of Romania
The principality was organized as a classic feudal state: William/Geoffrey divided the Morea into twelve baronies centered on castles, held by a Frankish military elite over a Greek population. The prince was "first among equals"; the great lords sat in the High Court (la Haute Court); a Lower Court (Court de la Borgesie) handled common law. Its law code, the Assizes of Romania (formally the Book of the Usages and Statutes of the Empire of Romania, compiled c. the 1330s, comprising a prologue and 219 clauses), drew — in the words of medievalist David Jacoby — on the Assizes of Jerusalem (because "the Latins faced political and military circumstances similar to those of the Morea"), plus French and Angevin law and Byzantine law on serfs (paroikoi); it became the common law of Frankish Greece and survived in the Venetian Ionian Islands into the 18th century.
History
Under William II of Villehardouin (1246–1278) Achaea reached its zenith but overreached: captured at Pelagonia (1259), William ransomed himself by ceding the fortresses of Mystras, Monemvasia and Maina to Byzantium (1262) — the seed of the Byzantine Despotate of the Morea that would slowly reconquer the peninsula from its capital at Mystras. In 1278 the principality passed to Charles I of Anjou of Naples (via Baldwin II's grant of the overlordship in return for support in reconquering Constantinople), who ruled through baillis. The 14th century brought the destructive feudal conflict of the Morea (1307–1383), Angevin and then Navarrese Company control, and Zaccaria (Genoese) princes. The last prince, Centurione II Zaccaria, ceded ground to the Byzantines; Achaea effectively fell to the Despotate of the Morea by 1430–1432, and the whole Morea fell to the Ottomans by 1460.
Common questions
- What was the Principality of Achaea?
- The premier Frankish state in Greece, in the Morea (Peloponnese), founded 1205 by William of Champlitte and Geoffrey I of Villehardouin after victory at the Battle of the Olive Grove of Koundouros. Geoffrey I secured the principality for himself through legal maneuvering (the "year and a day" ploy, with Venetian help delaying his rival Robert of Champlitte) and became prince (to 1219).
- When did the Principality of Achaea exist?
- The Principality of Achaea existed 1205–1432/1460s. On this map it is drawn 1206–1278, 1294–1325, 1385–1439.
- How large was the Principality of Achaea?
- At its greatest extent drawn on this map, the Principality of Achaea covered about 20,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.
- Who ruled the Principality of Achaea?
- Under William II of Villehardouin (1246–1278) Achaea reached its zenith but overreached: captured at Pelagonia (1259), William ransomed himself by ceding the fortresses of Mystras, Monemvasia and Maina to Byzantium (1262) — the seed of the Byzantine Despotate of the Morea that would slowly reconquer the peninsula from its capital at Mystras.
Sources
This compendium cites its sources once for the whole document rather than per territory. Its bibliography names the English Wikipedia articles for each polity as the primary basis, cross-checked against Encyclopædia Britannica, the World History Encyclopedia and the scholarship of Donald Queller, Thomas Madden and Jonathan Harris on the Fourth Crusade, whose post-conspiracy reading of 1204 this document follows. The article this entry is anchored on:
- Wikipedia — Principality of Achaea en.wikipedia.org/wiki/Principality_of_Achaea
This entry was last updated .
This entry was researched and drafted with AI from the sources above, and has not been reviewed by a historian. How entries are made
Text available under CC BY-SA 4.0: reuse it with a credit to The World Through Time and a link to this page. Passages drawing on the Wikipedia articles listed above are also licensed CC BY-SA 4.0 by their contributors.
Border geometry for the map itself comes from Cliopatria v0.12 (Seshat Global History Databank, CC-BY-4.0).
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