Around 1150 B.C.E., the Mycenaean civilization experienced a significant decline, marking the end of their dominance in the Aegean region. This period is characterized by a combination of factors, including invasions, internal strife, and possibly natural disasters, which contributed to their collapse.
However, the Mycenaeans were not conquered by the Minoans; rather, the Minoan civilization had already declined by this time, primarily due to similar factors. The Mycenaean civilization did not vanish or migrate to Crete; instead, they experienced a collapse of their palatial society and economy, leading to a period known as the Greek Dark Ages.
During this time, many Mycenaean centers were abandoned, and literacy (e.g., Linear B script) was lost, which indicates a significant cultural and economic regression. Eventually, some aspects of Mycenaean culture were incorporated into the later Greek civilization that emerged in the 8th century B.C.E.
In summary, around 1150 B.C.E., the Mycenaean civilization did not conquer or migrate but rather fell into decline due to various factors, leading to a transformative period in ancient Greek history.