Atta Olivia Clemens Series by Chelsea Quinn Yarbro

The time is 1189 A.D. and war rages all around the Mediterranean. Any woman would fear travelling among the pirates, bandits, and renegade Christian Knights, but Atta Olivia Clemens is no ordinary woman--rather, she is a vampire and the perils she faces are even more deadly.

Olivia Atta Clemens, immortal vampire, Roman noblewoman, beloved of the Count Saint-Germain-has come to Paris seeking only peace. But the year is 1637, and there is no peace to be found in the Court of Louis XIII, where Cardinal Richelieu maneuvers to control the throne. Caught up in the intrigue against her will, Olivia seeks and wins the protection of a young guardsman named d'Artagnan-a man destined to become one of the greatest heroes of all time.