Dark Age of Camelot
Set in Europe's mythological past, Camelot incorporates Arthurian legends, Norse mythology, and Irish Celtic lore. Players choose which realm to serve during character creation: noble Albion, brutal Midgard, or mystical Hibernia. Each realm has unique character races and classes, such as elves, trolls, and highlanders. Once chosen, the player's character will serve that realm forever. Once the character has gained in power, he or she will be asked to defend the realm from invasion and to go on raiding parties into other realms.

More details:

US Version Amazon.com (US dollars)

European version Amazon.co.uk (UK pounds)

Guide book for the game:

Amazon.com (US dollars)
Amazon.co.uk (UK pounds)
 

Vampire : The Dark Ages: A Storytelling Game of Gothic Horror (Vampire)

by Jennifer Hartshorn, Ethan Skemp, Mark Rein, Hagen Hassall, Kevin Hassall
Essentially the same rules as Vampire: The Masquerade. But the timeframe is shifted to the 'Dark Ages'.

Amazon.com (US dollars)
Amazon.co.uk (UK pounds)