The Oscar-winning British playwright behind Mozart biopic ‘Amadeus’ has passed away aged 90.

Sir Peter Shaffer, the playwright behind the hit plays Amadeus, which became a multi-Oscar-winning film in 1984, and Equus, has died aged 90 at the Marymount Hospice in Cork, Ireland. His niece Cressida was by his side as Shaffer “passed away peacefully,” according to a statement issued by the playwright’s agent, Rupert Lord. The statement continues, describing Shaffer as “one of the true greats of British theatre, a wonderful friend, wickedly funny man and sparkling raconteur who loved music, painting and architecture.” Shaffer only became seriously ill last week, so despite his advanced age, his death has come unexpectedly for his family and friends.

Shaffer was most notably championed by the National Theatre in London, which presented the world premieres of many of his plays. In a statement, National Theatre director Rufus Norris described Shaffer as “one of the great writers of his generation,” adding, “The plays he leaves behind are an enduring legacy.”

Among his 18 stage works, Amadeus and Equus have enjoyed the most widespread international success, with both plays earning Shaffer a slew of gongs including two Tony Awards....