Varius

Varius was an American Assassin and a member of a New York City gang who was active during the American Civil War. Like his father before him, Varius was the only Assassin established in the city, the Mentor having decided that a lone undercover agent was the more efficient way to thwart the Templar Order's plans.

In 1863, as tensions were bowling due to the War, he was instructed to steal a Dagger of Eden hidden in the Aztec Club in order to deliver it to General Ulysses S. Grant. At first, Varius succesfully recovered the Piece of Eden, but was later hunted by Cudgel Cormac who seriously injured him and almost claimed the artifact for his Order. However, thanks to his new recruit, the gifted Eliza, the artefact eventually ended up into the hands of Grant.

Reference

 * Assassin's Creed: Last Descendants