Can you name these European countries by the first documented or otherwise accepted monarch to rule them?
Includes certain predecessor states.
Of course, most of these are shrouded in mythology, lore, and legend, and are open to interpretation. All information was taken from Wikipedia. Please let me know if there are any corrections you'd like me to make.
I tried including the first monarch of a defined nation-state or tribe, rather than the ruler of a country already ruling the place.