Arcadocypriot or southern Achaean was an ancient Greek dialect spoken in Arcadia in the central Peloponnese and in Cyprus. Its resemblance to Mycenaean Greek, as it is known from the Linear B corpus, suggests that Arcadocypriot is its descendant. Proto-Arcadocypriot (~1200 BC) is supposed to have been spoken by Achaeans in the Peloponnese before the arrival of Dorians; for this, it is named also southern Achaean. The isoglosses of the Cypriot and Arcadian dialects testify that the Achaeans had settled in Cyprus. As Pausanias reported:
The establishment happened before 1100 BC. With the arrival of Dorians in the Peloponnese, a part of the population moved to Cyprus and the rest was limited to the Arcadian mountains. After the collapse of the Mycenaean world, communication did not exist and Cypriot was differentiated from Arcadian. It was written up to the 3rd century BC with Cypriot syllabary.Kypros — Salamis — ca. 600 BC Kypros — Kourion ~320 BC
Tsan was a letter only in use in Arcadia, up to ca. the 6th century BC. Arcadocypriot kept many characteristics of Mycenaean, early lost in Attic and Ionic, such as the /w/ sound (digamma).