Excerpts from Books and Wikipedia
"The Minoan goods found in Mycenaean graves reflect a temporary Cretan dominance. But after the eruption of Thera, the cultural influence between Crete and Greece began to run the other way. Distinctively Mycenaean pottery and cups appeared with greater frequency in Minoan houses, and by 1500 or so, Cretan tombs began to show a distinctively Mycenaean design that had not appeared on the island before. The tribute of Athens to Knossos had reversed itself. . . . Sometime around 1450, the city of Knossos was sacked, although its palace remained standing. The palaces of Mallia and Phaistos were flattened. Across Crete, some towns were abandoned; others shrank, abruptly, as if their young men had fought and fallen, or fled. No traces of a new culture appear on the landscape. We can only assume that the Mycenaean-Minoan relationship had degenerated still further, from thorny jousting into out-and-out war. The survival of the Knossos palace implies that someone in the invading force needed the Minoan center of government for his own uses; whatever Mycenaean king led the invasion may have used Knossos as his own headquarters."