Jacques DuQuesne was a childhood friend of Clint Barton. He later became the costumed mercenary Swordsman. He later joined the Avengers, at first for nefarious reasons, but soon resolved to become a true Avenger to redeem himself.
The Swordsman was a superb athlete and an excellent unarmed combatant. He was a master of bladed weapons, most notably all forms of the sword. When it comes to pure swordsmanship, he may have been unequaled.