The Dark Ages were dark because there was no sun at that time.

As near as I can tell, there were no parliaments until after the Dark Ages ended. The term Dark Ages is a term usually applied to a time starting in the 5th century and ending in the 11th. The earliest parliaments seem to have started up in the 12th century.

With the collapse of the Western part of the Roman Empire in AD 476. However, professional historians generally avoid the term Dark Ages.

The period from 1100 to 750 BC in Greece is called the Greek Dark Ages, but since there were other periods in other places also called Dark Ages, it is a good idea to be careful about how the name is used.

It is probably best not to use the term "the Dark Ages" to apply to the Greek Dark Ages, because most people who use the term without qualification mean Western Europe during the period of 476 to 1000 AD. It is also a term that has fallen out of use among historians.

Dark Ages