Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages, and one of the first civilizations in the world along with Ancient Egypt and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers were able to grow an abundance of grain and other crops, the surplus of which enabled them to settle in one place. Prehistoric proto-writing dates back before 3000 BC. The earliest texts, from c. 3300 BC, come from the cities of Uruk and Jemdet Nasr; early cuneiform script emerged around 3000 BC.
Minoan civilization
The most well-known script is Linear A, dated to between 2500 BC and 1450 BC. Linear A is the parent of the related Linear B script, which encodes the earliest known form of Greek. Several attempts to translate Linear A have been made, but consensus is lacking and Linear A is currently considered undeciphered. The language encoded by Linear A is tentatively dubbed "Minoan". When the values of the symbols in Linear B are used in Linear A, they produce unintelligible words, and would make Minoan unrelated to any other known language. There is a belief that the Minoans used their written language primarily as an accounting tool and that even if deciphered, may offer little insight other than detailed descriptions of quantities.