Charles Gabriel Sivert

Charles Gabriel Sébastien Sivert, Baron de l'Espérance (1 December 1725 – 5 January 1791) was a Brigadier general in the French military, the colonial governor of before his retirement in 1789, and a member of the Templar Order, active during the French Revolution.

Sivert was an advisor of Grand Master François de la Serre, but secretly conspired with former Templar Francois-Thomas Germain to overthrow de la Serre. Sivert was responsible for personally recruiting Le Roi des Thunes and his enforcer Aloys la Touche into the Templar Order, after the former was rejected membership by de la Serre.

On 5 May 1789, Sivert and the other Templars attended a party at a palace, which was secretly the induction of de la Serre's daughter, Élise, into the Templar Order. Germain's secret faction used the occasion to assassinate de la Serre.

Sivert lured de la Serre out to the palace gardens, where he assaulted the Grand Master. However, de la Serre managed to fight off Sivert, wounding the latter's face and blinding his left eye. Nonetheless, Le Roi des Thunes snuck up from behind and struck de la Serre with a poisoned pin crafted by Germain, killing him instantly.

As the two Templars made their escape, Sivert called out to a guard and framed Arno Dorian, who had witnessed the murder of his adoptive father.

On 5 January 1791, Sivert was stalked by Arno, who had escaped imprisonment and joined the Assassins. Arno tailed the Templar to Notre Dame, where Sivert was supposed to meet one of his accomplices. Arno assassinated Sivert's accomplice and snuck into a confession booth, where Sivert was supposed to meet his accomplice.

Posing as the accomplice, Arno received information about the Templars' manipulations against the corruption of the church. Once Sivert revealed all that he knew, Arno stabbed Sivert's throat with his hidden blade, killing him instantly.

Through Sivert's memories, Arno discovered Le Roi des Thunes' involvement in de la Serre's murder.

Reference

 * Assassin's Creed: Unity