Patrick Stewart, the classically trained actor who added Shakespearean gravitas to the “Star Trek” and “X-Men” franchises, has died. He was 86.

Stewart died Wednesday in Los Angeles, following “a brief and poignant journey” with Alzheimer’s disease and Lewy Body Dementia, spokesperson Kelly Bush Novak said. Stewart’s diagnoses had not been previously disclosed.

“We lost one of the greats of stage and screen today,” Hugh Jackman, a frequent Stewart co-star in the “X-Men” universe, said on social media. “And, in my book, a tremendous friend and man. I learned so much from him. I will miss you, Patrick Stewart, all of my days.”

While best known as Professor Charles Xavier and Captain Jean-Luc Picard from the “X-Men” and “Star Trek: The Next Generation” series and films, respectively, Stewart spent more of his career onstage than in the X-Mansion or on the USS Enterprise.

Besides playing everyone from Claudius to Macbeth, he often performed a one-man rendition of “A Christmas Carol” and did West End and Broadway runs of Harold Pinter’s “No Man’s Land” and Samuel Beckett’s “Waiting for Godot” in repertory with buddy Ian McKellen.

“He wore his heart on his sleeve, which made him a man to rely on, to admire and in my case, love,” McKellen posted on social media.

He won three Olivier Awards, including one for playing Claudius in “Hamlet” opposite David Tennant. And he had a Grammy — in 1996 for best spoken word album for his recording of “Peter and the Wolf.”

He achieved some of the best reviews of his career when he finally tackled Macbeth for the first time. The production, under the direction of Rupert Goold, debuted in May 2007 at England’s Chichester Festival Theatre, switched to London’s West End and then moved to the Brooklyn Academy of Music before transferring to Broadway in 2008.