Medieval Period and Dark Ages

[mercian billman]

This question may have been asked before, but I would like to know when exactly did the dark ages begin? When did they end? and Why does the medieval period begin in 1087, and why do the hig, and late periods begin when they do. Also I know that the fall of Constantinople marks the end of the medieval period.

Any help would be appreciated
Thanks in Advance

[motorhead]

From some history site:
/start
The Dark Ages
Early scholars gave the name Dark Ages to the period in Europe after the fall of the Roman Empire. During this period, barbarian Goths, Vandals, and Huns swept down on Europe from the north and east. They destroyed many fine buildings and works of art that had existed during Roman times. During the Dark Ages, knowledge survived only in monasteries, and there were very few schools. Many of the old arts and crafts were lost. This is why the time was called the Dark Ages.
/end
1087 - The Domesday book commisioned by William the Conqueror to establish who had what in his lands
1205 - Magna Carta - formalized the feudal system
1321 - Dante's Divine Comedy

Early to High: 116 years
High to Late: 116 years
Late to Fall: 132 years

My guess is the dates/events were set partly due to significance (Domesday and Magna Carta) and partly for gameplay (late campaigns given a bit more time since you can't continue past 1453). Just my .02.