Starts in Camelot Castle with Merlin, ask him excalibur.
Then there are 4 locations that you chase Merlin around and ask him excalibur each time. He tells you the spots
At each spot ask merlin excalibur.
1st isn't far from Snowdonia
2nd is south, down of Morgana
3rd is near Folkington
4th is swnne from Owain
Completion of this also gives you the following 3 stat quests in place of the Greece Stat quests:
+3 strength
+3 Constitution
+3 Dexterity
NOTE: You are given the stats for these quests IF you haven't done them yet. One thing yet to test is if you go through and DO the quests if you get the xp you would from those. So it essentially will give you 4 total whois in one.
NOTE 2: This is also how you activate the stonehenge era transitions. Once completed you can walk north from Stonehenge to get to crossroads in Tara, south to get to the docks in Casablanca or east to go to The Monkey Inn in medieval China.