Ott Jud was a 15th century Austrian martial arts master, specialized on grappling

Grappling

Grappling refers to techniques, maneuvers, and counters applied to an opponent in order to gain a physical advantage, such as improving relative position, escaping, submitting, or injury to the opponent. Grappling is a general term that covers techniques used in many disciplines, styles and martial...

 (Ringen).

The version of his treatise in Codex Lew states that he was a baptized Jew.

Paulus Kal

Paulus Kal

Paulus Kal was a 15th century German fencing master. In 1460, he wrote a combat manual describing the art of fencing .-Literature:...

 describes him as the wrestling master to the rulers of Austria, and names him as a member of the Society of Liechtenauer.

Ott's treatise on ringen is repeated throughout all of the early German treatise compilations and seems to have become the dominant work on the subject within the Liechtenauer tradition.