Sébastien Le Livre

Sébastien Le Livre, primarily known by the alias Booker, is a character in The Old Guard. In the film adaption, he is played by Belgian actor Matthias Schoenaerts.

History
Booker was a criminal and forger, having been to prison at least once before; upon being arrested again, he was offered a choice of dying in prison or to serve in Napoleon's army. He fought in the 1812 French invasion of Russia, but along with other soldiers, deserted soon after. He was quickly captured and hanged. After coming back to life, still in the noose, he pretended to be dead long enough for the army to pass beneath him, (in the comics he is shown eating a crow).

Booker is still a new member of the team, being 250 years old during the events of the film. Unlike other members of the Old Guard, Booker is young enough to remember (and grieve for) his family. He mentions having had a wife and three sons (in the comics he mentions being a father of four).

Promotional posters for the Netflix film state Booker's birthdate as 1770.

Booker is suggested through the film to suffer from depression and alcoholism, stemming in part from guilt that he was unable to share his ‘gift’ with his own children. His youngest son Jean-Pierre died of cancer at the age 42, and was the last of his children to die.

Plot
Booker in the film, as well as the comics, betrayed the guard, setting them up for an ambush and surrendering them to James Copley, then to Stephen Merrick. After the guard escape, the punishment for his betrayal is 100 years of exile, which he accepts.

The Old Guard: Force Multiplied
Following the aftermath of Booker's betrayal, he is seen living on his own in Marseilles. Stumbling home drunkenly one night, he finds the front door of his place unlocked and a woman waiting for him. She chooses not to identify herself and instead asks the whereabouts of the rest of his team. He attempts to shoot her down, but is incapacitated. He is taken to her yacht for further interrogation and, still refusing to comply, is shackled by the neck, with the woman claiming she now "owns" him.

Trivia

 * Le livre in French means "book."