The ___ marked the end of the Mycenaean civilization around 1100 bc.

Dorian invaders

Explanation:

Around the year 1200 BCE the Mycenaean civilization shows signs of decline. By 1100 it was extinguished. The palaces were destroyed, and their system of writing, their art, and their way of life were gone ... According to Greek legends, they were replaced by half-civilized Dorian invaders from the north.