Sentence:  La Trappe, a Frenchman, was a gloomy <WSD>disciplinist</WSD> and recluse, and a founder of a set of devotees, who are obliged to live in the practice of the utmost austerities, and without ever speaking to each other. 
Meaning of the word marked with <WSD> tags:  A disciplinarian; one who stresses obedience to authority.