Why is the 300 year period of time in greece beginning around 1100 bc called the dark age

The dark ages of Greece were the times when Greece was in poverty and they had no new inventions, famous people, important people, basically greece wasnt the cool empire at the time!:)
hope that helped

Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.