 Complete the following phrase:  The city of Troy shows two famous destruction layers, Level 2 dated approximately 2200 BCE and Level 7 dated approximately 1200 BCE, and linked with the Trojan War. The destruction layers associated with Knossos in Crete was for a long time associated with the invasion of Archaeans led by Thesius, until it was proven by Michael Ventris that the Linear B syllabary was a form of early Greek language. The destruction of the cities of the Mycenaean Greece were for a long time associated with arrival of the Dorians, before closer excavation showed that these destructions were not contemporaneous, and in fact pre-dated the so-called Dorian invasions by a century or more. The volcanic explosion of 