The Founding of the Round Table.
Why a round table? DS#1 - There was not a high or low end.
Mom's narration: The knights had been fighting for the best seats as a regular table. The seats at the top of the table were considered for the more honorable and the seats at the bottom of the table were the less honorable. King Arthur was saddened by the fighting of his knights and thought how can my kingdom have peace when my knights were fighting about where to sit. Merlin suggested a round table where there was not a top or bottom.