<span>Each Monday, this column turns a page in history to explore the </span><span>discoveries, events and people that continue to affect the history being made today.
</span> Europe was mired in a centuries-long dark age before a king named Charlemagne came along and turned on the light switch.
By encouraging arts, culture and education, the 8th-century Frankish king – who would eventually become the first Holy Roman Emperor – tugged the continent out of cultural stagnation that threatened to never end.
Both a fierce warrior and in many ways the first Renaissance man, Charlemagne's achievements on the battlefield and in his laws led to the first notion of a pan-European identity.
The group that fought in the Trojan war was the Greeks.
Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
