Roman Castevet

Roman Castevet is a main character as well as the primary antagonist of the miniseries. Portrayed by actor Jason Isaacs.

Personality and Appearance
Full of charm and charisma, Roman Castevet is a diabolical seducer of the masses, a patron of the arts and a rich member of high society.

Dashing lover and loyal friend is a man who keeps his word, especially when in exchange gets the soul of those he rescued. Although he shows as cordial, Roman is actually capable of horrible atrocities and is also a skilled extortionist, one of those who uses a friendly smile while they cut your throat.

Roman has the physical appearance of a middle-aged man; short dark hair, cold and manipulative eyes, a slightly tanned complexion and an earring in his left lobe. Always wear haute couture clothes, dark and elegant. He has an aristocratic posture, though often at home assume comfortable positions and often walks barefoot among the spacious rooms of La Chimere.

Throughout the series
To be added

Trivia

 * Unlike the film adaptation and the novel, in the television adaptation Roman Castevet and Steven Marcato are two distinct characters since during the priest's narration about Steven Marcato, the man shown in the flashback was the Blue-eyed Man and not Roman Castevet.
 * Furthermore, Roman was with other members of the cult when the Blue-eyed Man raped Rosemary during their satanic sabbat.
 * However, in Night Two while talking with Rosemary, even Roman Castevet had the supernatural blue eyes for a few seconds. Since the newborn also proved to have the same eye color, it's possible that it's a trait shared by those fathered by the Devil.