Charles de la Motte

Charles de la Motte was a French member of the Templar Order.

His genetic memories were later used by Abstergo Industries for the training of the Animus recruits, under the title of the Marquis.

Tournament
"The Frenchman Charles de la Motte questions the courage of Italia and has called a tournament to prove his men are superior."

- Francesco Vecellio.

In 1503 at Barletta, Charles entered in a contest with his fellow Templar, Cesare Borgia, where he aimed to prove France's superiority.

This competition was sabotaged by the Assassins, who dusted the French participants' supplies with poison, which caused them to underperform. No foul play was detected, and the Italians' victory was deemed fair.

Alliance
"If the Church and its army turn their heads, there is no telling what harm de la Motte will cause here!"

- Francesco, regarding Charles' return to Rome.

Later that same year, Charles and his men returned to Rome upon Cesare's invitation and received no interference from the Papal armies. The French mercenaries began to assault the citizens, insulting and stealing from them, while the city guards warned off any who tried to stop them.

Concerned, the Assassins moved to intervene, and the team led by Francesco Vecellio dispatched several of the Frenchmen with arrows and poisoned flowers, which were given to the troops by Tessa Varzi.

Despite killing several of the soldiers, the combined power of the Borgia and French troops eventually drove the Assassin team into retreat, forcing them to take refuge in an inn. The building was soon set ablaze, and many Assassins (Tessa Varzi and Cipriano Enu among them) lost their lives in the flames.

Source

 * Assassin's Creed: Project Legacy - Chapter 3 - Francesco Vecellio