Atlas games - Ars Magica

Publisher's site. "Come to a land of adventure and mystery, of falling empires and rising nations, of legendary creatures and incredible myths. This is Ars Magica's Mythic Europe, where the power of magic is real and exists alongside historical figures and locations. Stories revolve around the covenant: one part mystical college, one part magical laboratory, one part Hermetic fortification, one part bastion of secrecy."