A relative humidity level between 40% and 50% is generally considered to be the most comfortable. Anywhere from 30% to 60% is acceptable, but ideally you want to avoid the extremes of that range.
Ancient Greek civilization began around 1600 BC, at Mycenae and in Crete. It ended with the annexation of Greece by Rome in 146 BC. It was at its height around 431 BC, when the Peloponnesian War between Sparta and Athens began.
The history of the Ancient Greek civilization is divided into two eras, the Hellenic and the Hellenistic The Hellenic period commenced circa 900 BC, (with substantial works of architecture appearing from about 600 BC) and ended with the death of Alexander the Great in 323 BC.