The answer is Abraham Lincoln
We should cease to celebrate Columbus Day, first because it is ludicrous to say a place already inhabited can be "discovered"; second because Columbus failed to add anything new to the pool of European knowledge
King Arthur lived around the 500 A.D.
The main people I would say believed on it at the time it was created were the egyptian slaves and Moses whom found it when God told him to go at the top of Mount Sinai which I think is where he died as well. Other than that those who believe in God and live by the ten commandments including myself believe in the ten commandments.