Linear A is an undeciphered writing system that was used by the ancient Minoans who flourished on Crete between roughly 2500 B.C. and 1450 B.C. The existence of the script was first noted by British archaeologist Sir Arthur Evans in 1893 when he was excavating the Minoan city of Knossos on the island of Crete. He discovered two different systems, which he called Linear A and Linear B. While Linear B was deciphered in the early 1950s (it turned out to represent an early form of Greek), Linear A, above, has still not been deciphered.