The Legacy: Ultima Online.
"...And the unknown hero traveling trough time and space
face Mondain for the last time
With a mighty blow of his mystic sword, the stranger
smashed into a thousand pieces the black jewel,
opening the path to a thousand worlds with a thousand destiny..."
There are several tales about another parallel world, which is very similar to the old Sosaria. Not only the lands are similar, but also several ethereal travelers had founded the duplicates of personalities, friends, relatives and even of themselves.
Its very likely that Mondain's gem of immortality had created several copies of Sosaria, when the Avatar smashed it.
This Strange lands are ruled by another Lord British, and a very enigmatic Lord Blackthorn. The two leaders are reported to be in a constant fight for the rule and power of the lands.
The population lives in a pre medieval stage, (a little more primitive that ours Britannia), and most warriors are separated in different Clans, that join themselves to accomplish their destinies on life.
The main difference between this parallel world and our Britannia is that the Avatar never existed, so no devotion to the Virtues is founded.