1194:

Richard I crowned again

After having been held captive for two years by Emperor Henry VI, Richard felt it was necessary to demonstrate his sovereignty over England, and so he had a second coronation. Less than one month later he left the country, never to return.

1397:

The Kalmar Union

The coronation of Erik of Pomerania as king of Norway, Sweden and Denmark united the kingdoms in a union that would last until 1523.

1239:

Edward I