|Extinct||attested 6th century BC|
Location of Lemnos
The Lemnian language was spoken on the island of Lemnos in the 6th century BC. It is mainly attested by an inscription found on a funerary stele, termed the Lemnos stele, discovered in 1885 near Kaminia. Fragments of inscriptions on local pottery show that it was spoken there by a community. In 2009, a newly discovered inscription was reported from the site of Hephaistia, the principal ancient city of Lemnos. Lemnian is largely accepted as being closely related to Etruscan. After the Athenians conquered the island in the latter half of the 6th century BC, Lemnian was replaced by Attic Greek.
The Lemnian inscriptions are in Western Greek alphabet, also called "red alphabet". The red type is found in most parts of central and northern mainland Greece (Thessaly, Boeotia and most of the Peloponnese), as well as the island of Euboea, and in colonies associated with these places, including most colonies in Italy.  The alphabet used for Lemnian inscriptions is similar to an archaic variant used to write the Etruscan language in southern Etruria.
- both Etruscan and Lemnian share two unique dative cases, type-I *-si and type-II *-ale, shown both on the Lemnos Stele (Hulaie-ši "for Hulaie", Φukiasi-ale "for the Phocaean") and in inscriptions written in Etruscan (aule-si - "To Aule" - on the Cippus Perusinus as well as the inscription mi mulu Laris-ale Velχaina-si, meaning "I was blessed for Laris Velchaina").
- They also share the genitive in *-s and a simple past tense in *-a-i (Etruscan -⟨e⟩ as in ame "was" (< *amai); Lemnian -⟨ai⟩ as in šivai, meaning "lived").
Rix's Tyrsenian family has been confirmed by Stefan Schumacher,  Carlo De Simone  and Simona Marchesini. Common features between Lemnian, Etruscan, and Rhaetic have been found in morphology, phonology, and syntax. On the other hand, lexical correspondences are rarely documented, due to the scanty number of Rhaetian and Lemnian texts, and, above all, due to the very ancient date at which these languages split, because the split must have taken place before the Bronze Age, much earlier than was suggested by Rix.
The Lemnian language could have arrived in the Aegean Sea during the Late Bronze Age, when Mycenaean rulers recruited groups of mercenaries from Sicily, Sardinia and various parts of the Italian peninsula.
Like Etruscan, the Lemnian language appears to have had a four-vowel system, consisting of "i", "e", "a" and "u". Other languages in the neighbourhood of the Lemnian area, namely Hittite and Akkadian, had similar four-vowel systems, suggesting early areal influence.
The stele was found built into a church wall in Kaminia and is now at the National Archaeological Museum of Athens. The 6th century date is based on the fact that in 510 BC the Athenian Miltiades invaded Lemnos and Hellenized it. The stele bears a low-relief bust of a man and is inscribed in an alphabet similar to the western ("Chalcidian") Greek alphabet. The inscription is in Boustrophedon style, and has been transliterated but had not been successfully translated until serious linguistic analysis based on comparisons with Etruscan, combined with breakthroughs in Etruscan's own translation started to yield fruit.
The inscription consists of 198 characters forming 33 to 40 words, word separation sometimes indicated with one to three dots. The text consists of three parts, two written vertically and one horizontally. Comprehensible is the phrase aviš sialχviš ("aged sixty", B.3), reminiscent of Etruscan avils maχs śealχisc ("and aged sixty-five").
- A.1. hulaieš:naφuθ:šiaši
- A.2. maraš:mav
- A.3. sialχveiš:aviš
- A.4. evisθu:šerunaiθ
- A.5. šivai
- A.6. aker:tavaršiu
- A.7. vanalasial:šerunai:murinail
- B.1. hulaieši:φukiasiale:šerunaiθ:evisθu:tuveruna
- B.2. rum:haraliu:šivai:eptešiu:arai:tiš:φuke
- B.3. šivai:aviš:sialχviš:marašm:aviš:aumai
- upper line (left to right):
- lower line (right to left):
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