Editing Achaea (section)

===Medieval history===
[[File:Byzantine Greece ca 900 AD.svg|thumb|right|Byzantine Greece, ca. 900 AD]]
[[File:Greece in 1210.svg|thumb|right|Map of Frankish Greece with the [[Principality of Achaea]].]]
Achaea remained a province of the [[Byzantine Empire]] after the [[fall of the Western Roman Empire]]. In the 6th and 7th centuries, [[Early Slavs|Slavs]] invaded Greece and reached the Peloponnese, settling there. The coastal cities remained largely under Byzantine control, and a [[Siege of Patras (805 or 807)|Siege of Patras]] in 805/807 failed. By the end of the 9th century, the whole peninsula was firmly under Byzantine control again, forming the [[Theme of the Peloponnese]]. 

After the [[Fourth Crusade]] several new [[Crusader states]] were founded in Greece. One of these was the [[Principality of Achaea]], founded in 1205, which like the Roman province covered a much larger area than the Achaea region. The Achaea region was among the core territories of the Principality, with four baronies: the extensive [[Barony of Patras]], the [[Barony of Vostitsa]], the [[Barony of Chalandritsa]], and the [[Barony of Kalavryta]]. Patras, under the powerful [[Latin Archbishopric of Patras]], over time became a semi-autonomous domain under the protection of Venice and the Holy See. Although Kalavryta was lost to the [[Byzantine Greeks]] already by the end of the 13th century, the other baronies survived until the Principality of Achaea was conquered by the Byzantine Empire in 1430, and became part of the [[Despotate of the Morea]].

The Despotate of the Morea fell to the [[Ottoman Empire]] in 1460. As a part of the [[Morean War]], the [[Republic of Venice]] captured Achaea in 1687 and [[Kingdom of the Morea|held it]] until 1715, when the Ottomans [[Ottoman reconquest of the Morea|recaptured]] the Peloponnese. Under Ottoman rule, Achaea was part of the [[Morea Eyalet]].