Wrestling legend Ole Anderson — who helped form The Four Horsemen in the 1980s — has died at 81 years old.

The WWE confirmed the sad news Monday evening … remembering him in a statement as “a prolific and decorated tag team wrestler” who had a “hard-nosed style and gruff demeanor.”

“WWE extends its condolences to Anderson’s family, friends, and fans,” the org. added.

A cause of death was not revealed.

Anderson — real name Alan Rogowski — began his wrestling career in the ’60s … but really made his mark in the squared circle in the 1980s.

He, Ric Flair, Arn Anderson and Tully Blanchard created the heel stable The Four Horsemen …. and the quartet eventually went on to have legendary matches across multiple promotions against some of the most iconic wrestlers of all-time.

After news of his death broke, Flair said in a post on X that Ole helped launch his career.

“I Will Be Grateful Forever For You Giving Me The Opportunity To Become Who I Am Today,” Flair wrote. “We Didn’t Always Agree With Each Other, But The Honest To God Truth Is You & Gene Started Me. Rest In Peace My Friend!”

In addition to his time on the mat, Anderson also worked as a manager, promoter and even an exec in the wrestling world.

“AEW and the wrestling world mourn the passing of the legendary Ole Anderson,” All Elite Wrestling officials said in a statement Monday night. “Our thoughts are with his family, his friends and his fans.”