The democrats
An empire grows by claiming more land around it. This is generally accomplished by conquering the neighboring countries, city-states, or regions, and making them part of the empire. New land can be acquired peacefully as well through treaties and alliances.
Ideology always has dominated society and has always been part of man’s experience, so the dates you ask about are not extraordinary in anyway concerning ideology.
A megalith is a large stone that has been used to construct a structure or monument, either alone or together with stones.
The Black Death (widely believed to have been bubonic plague) which reached its peak around 1348-1350 is estimated to have killed between 30% and 60% of the population of Europe. The Hundred Years War between two of the great powers in Europe, England and France, began in 1337, coninued for the rest of the century and over half of the next century, ending in 1453.
eastern europe - apex
There have been many Muslim Empires dominated by Islam. The last Muslim Empire or Caliphate was Usmani Caliphate (also known as the Ottoman Empire) in Turkey.
I would say that would have been Napoleon Bonaparte.
Napoleon Bonaparte; "Europe is a molehill. All great empires and revolutions have been on the Orient; six hundred millions live there."
There has never been an emperor of Europe. There have been emperors of European countries/empires, but not of Europe itself.
There have been tons of European empires, either based out of or in Europe. They include the Roman Empire, Macedonian Empire, British Empire, Holy Roman Empire, and Russian Empire.
If Napoleon had won then France would have continued to be the greatest power in Europe, and would not have been eclipsed by England: France would have become a large and wealthy country that dominated Europe. The 'what ifs' would go on forever about what MIGHT have happened or what COULD have happened if this HAD happened but it didn't. The European Union would have formed much more earlier.
Dacentrurus was a large stegosaur. Its bones have been found in Europe.
There is no single language that has been the official language of most empires.
Never for a longer period.
The democrats
The war in Western Europe began on May 10, 1940. Germany had been successful in Poland in 1939. With the East secured, Germany set its sights on Western Europe. France dominated Western Europe, and seemed well qualified to use all of its defensive power to halt the Germans.