Rodolphus Lestrange

"The Dark Lord will rise again, Crouch! Throw us into Azkaban; we will wait! He will rise again and will come for us, he will reward us beyond any of his other supporters! We alone were faithful! We alone tried to find him!"

—Bellatrix Lestrange declaring the loyalty of her and her husband to the Dark Lord

He and Bellatrix eventually married and both took the Dark Mark, fighting in the First Wizarding War. She married him only to uphold her family's tradition of marrying respectable pure-bloods and had no real love for him, being obsessed with Lord Voldemort herself. It is unknown if Rodolphus had any love for his wife.

Rodolphus participated in the Battle of the Department of Mysteries soon afterwards; he and Bellatrix were paired together, and pursued Luna Lovegood, Ron and Ginny Weasley into the Space Chamber. In the aftermath, Rodolphus was presumably returned to prison, although his wife eluded capture.

Rodolphus was one of Voldemort's most loyal Death Eaters and therefore can be considered to be sadistic and apure-blood supremacist. His crime against the Longbottoms confirms his willingness to use the Dark Arts to an unspeakable extent. He was not at all concerned about being sent to Azkaban as he "stared blankly" throughout the course of his trial.