Question 562

The legend states the origin of the X of Y to the Battle of Valdemar in Estonia, on June 15, 1219.
The battle was going badly, and defeat seemed imminent. But then, right when the people of Y were about to give up, the X fell from heaven. Grasping the X before it could ever touch the ground, the king took it in his hand, and proudly showed it to his discouraged troops, giving them hope, and leading them to victory.
The myth is clear. The X was given to the people of Y from God himself, and from that day forward, it was the X of Y, and Y's kings. Id X of Y and what is so special about it.

Answer: Flag of Switzerland. Cracked by all.