British playwright Peter Strafan won an Oscar to win Robert Harris' Pope Thriller Conclave.
Author, 56, has also won BAFTA, Golden Globe and Critics' Choice Award for Conclaves in this category. He had previously been nominated for an Oscar for his 2011 Tinker Tailor Soldier Spy adaptation.
Straughan won a BAFTA for that film. He co-written with his late wife Bridget O'Connor.
Straughan was also nominated for Emmy for the 2015 Hilary Mantel's Wolf Hall adaptation for the BBC. He also wrote the second season of that drama, which aired last year.
The writer wore a ribbon in blue and yellow colours of the Ukrainian flag. On the podium, he thanked the team, the film's cast and crew, screaming at his daughter.
Conclave was the surprise Victor at the Best Picture Awards at BAFTAS two weeks ago, and was the outstanding British Film Awards. Edward Berger's film has been nominated in eight Oscar categories.
For an adapted script, Oscar, Conclave defeated the completely unknown Synthing, Emilia Perez and the Nickel Boys.
The 97th Academy Awards will be held in Los Angeles.
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