Arthur is born (traditional estimate).

Begins training as a warrior.

Becomes king, often associated with drawing the sword from the stone or receiving Excalibur from the Lady of the Lake (depending on the legend).

Establishes Camelot and gathers the Knights of the Round Table.

Leads the Britons to victory at the Battle of Mount Badon (if identified with the historical battle).

The quest for the Holy Grail takes place in later medieval legends.

Fights the Battle of Camlann against Mordred. Arthur is dead and taken to Avalon.