Linear A based on Cretan hieroglyphs
Chronology
The earliest attestation of Linear A begins around 1800 BC (Middle Minoan IB). It became prominent around 1625 BC (Middle Minoan IIIB) and went out of use around 1450 BC (Late Minoan I).  It was contemporary with and possibly derived from Cretan hieroglyphs, and may be an ancestor of Linear B. The sequence and the geographical spread of Cretan hieroglyphs, Linear A, and Linear B, the three overlapping but distinct writing systems on Bronze Age Crete and the Greek mainland, can be summarized as follows:Discovery
Archaeologist Arthur 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 that were used during the same period.Several tablets inscribed in signs similar to Linear A were found in the Troad in northwestern Anatolia. While their status is disputed, they may be imports, as there is no evidence of Minoan presence in the Troad. Classification of these signs as a unique Trojan script (proposed by contemporary Russian linguist Nikolai Kazansky) is not accepted by other linguists.