Excerpts from Books and Wikipedia
"The archaeological evidence shows a widespread collapse of Bronze Age civilization in the Eastern Mediterranean world at the outset of the period, as the great palaces and cities of the Mycenaeans were destroyed or abandoned. Around then, the Hittite civilization suffered serious disruption and cities from Troy to Gaza were destroyed. Following the collapse, fewer and smaller settlements suggest famine and depopulation. In Greece, the Linear B writing of the Greek language used by Mycenaean bureaucrats ceased. The decoration on Greek pottery after about 1100 BC lacks the figurative decoration of Mycenaean ware and is restricted to simpler, generally geometric styles." [Wikipedia] At Mycenae on the Greek mainland, fortification walls, including the famous Lion Gate, were constructed in about 1250 BC. [1177 BC, Kindle, Location 1776] "In Greece, between 1200 and 1050 BC, Dorian invaders bring a Dark Age. . . . AFTER THE DEVASTATING VICTORY AT TROY, the Mycenaean ships had limped or blown back to the mainland of Greece, there to find that their homes had grown poor and troubled." [Bauer: Ancient World, p. 281-2]