Principality of Achaea
State · 1206–1439 CE · at its largest around 1206 CE
Frankish crusader state in the Peloponnese founded after the Fourth Crusade and ruled by the Villehardouin family; it was eventually retaken by the Byzantine Despotate of the Morea.
On its lands while it lasted
- Andravida (c. 1206 CE): Capital of Principality of Achaea (1206–1432).
More on Wikipedia.