Undeciphered writing systems in the context of Writing system

Linear A is a writing system that was used by the Minoans of Crete from 1800 BC to 1450 BC. Linear A was the primary script used in palace and religious writings of the Minoan civilization. It evolved into Linear B, which was used by the Mycenaeans to write an early form of Greek. It was discovered by the archaeologist Sir Arthur Evans in 1900. No texts in Linear A have yet been deciphered. Evans named the script "Linear" because its characters consisted simply of lines inscribed in clay, in contrast to the more pictographic characters in Cretan hieroglyphs – likewise undeciphered – that were used during the same period.

Linear A belongs to a group of scripts that evolved independently of the Egyptian and Mesopotamian systems. During the second millennium BC, there were four major branches: Linear A, Linear B, Cypro-Minoan, and Cretan hieroglyphic. In the 1950s, Linear B was deciphered and found to have an underlying language of Mycenaean Greek. Linear A shares many glyphs and alloglyphs with Linear B, and the syllabic glyphs are thought to notate similar syllabic values, but none of the proposed readings lead to a language that scholars can understand.

This is a list of languages arranged by age of the oldest existing text recording a complete sentence in the language. It does not include undeciphered writing systems, though there are various claims without wide acceptance, which, if substantiated, would push backward the first attestation of certain languages. It also does not include inscriptions consisting of isolated words or names from a language. In most cases, some form of the language had already been spoken (and even written) considerably earlier than the dates of the earliest extant samples provided here.

A written record may encode a stage of a language corresponding to an earlier time, either as a result of oral tradition, or because the earliest source is a copy of an older manuscript that was lost. An oral tradition of epic poetry may typically bridge a few centuries, and in rare cases, over a millennium. An extreme case is the Vedic Sanskrit of the Rigveda: the earliest parts of this text date to c. 1500 BC, while the oldest known manuscripts date to c. 1040 AD.Similarly the oldest Avestan texts, the Gathas, are believed to have been composed before 1000 BC, but the oldest Avestan manuscripts date from the 13th century AD.