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Messapic forms part of the Paleo-Balkan languages. Based upon lexical similarities with the Illyrian languages, some scholars contend that Messapic may have developed from a dialect of pre-Illyrian, meaning that it would have diverged substantially from the Illyrian language(s) spoken in the Balkans by the 5th century BC, while others considered it a direct dialect of Iron Age Illyrian. Messapic is today considered an independent language and not a dialect of Illyrian. Although the unclear interpretation of Messapic inscriptions cannot warrant the placement of Messapic in any specific Indo-European subfamily,[12] some scholars place Illyrian and Messapic in the same branch. Eric Hamp has grouped them under "Messapo-Illyrian", which is further grouped with Albanian under "Adriatic Indo-European".[13] Other schemes group the three languages under "General Illyrian" and "Western Paleo-Balkan".[14]
A number of shared features between Messapic and Proto-Albanian may have emerged either as a result of linguistic contacts between Proto-Messapic and Pre-Proto-Albanian within the Balkan peninsula in prehistoric times, or of a closer relation as shown by the quality of the correspondences in the lexical area and shared innovations between Messapic and Albanian.[15] Hyllested & Joseph (2022) identify Messapic as the closest language to Albanian, with which it forms a common branch titled Illyric. Hyllested & Joseph (2022) in agreement with recent bibliography identify Greco-Phrygian as the IE branch closest to the Albanian-Messapic one. These two branches form an areal grouping - which is often called "Balkan IE" - with Armenian.[16]