Career
He fought at the under King Richard the Lionheart during the Third Crusade. Richard had previously ordered no direct engagement with the enemy on the march to capture Jaffa. They were constantly harassed with arrows and small scale hit-and-run attacks in an attempt to disrupt and lure the crusader column into full battle.
According to the 13th-century manuscript Itinerarium Regis Ricardi, Garnier was near breaking point and rode forward in person to try to persuade Richard to attack:
My lord the king, we are violently pressed by the enemy, and are in danger of eternal infamy, as if we did not dare to return their blows.
We are each of us losing our horses one after another, and why should we bear with them any further? He also asked that Richard relieve the pressure with a cavalry charge. They were joined soon after by the rest of the Hospitaller force.
Richard, seeing that his orders were already disobeyed, signaled for a full charge. This caught the enemy at a vulnerable moment, and their ranks were broken.
In the video game Assassin"s Creed, Garnier de Nablus (Naplouse in the game) is one of the nine main assassination targets and is depicted as a man taking in those without sound mind, often by force, and experimenting on them in an attempt to cure them.
While being somewhat successful, this in-game portrayal of Garnier shows him as a cruel and sadistic man, greatly contrasting with his real life persona. In addition, he is assassinated in Acre in 1191, while historically he died in 1192 after fighting in the battle of Arsuf. Actor Donald Sumpter portrays Garnier in the 2008 British Broadcasting Corporation television docudrama series Heroes and Villains which features a reenactment of the battle at Arsuf.