Actor Jessie Buckley completed an award season sweep at the Oscars thanks to her acclaimed performance in the historical drama Hamnet . Buckley, 36, won the Academy Award for Best Actress for her performance in the historical drama Hamnet . Starring opposite Paul Mescal, the Irish actor portrays William Shakespeare ’s wife, Agnes (also called Anne Hathaway ) in the movie about the playwright and his family. She had already won Golden Globe, BAFTA, Critics Choice, and Actor awards for the part before taking home her biggest honor of all on Sunday. Adapted from Maggie O’Farrell’s best-selling 2020 novel of the same name and directed by Chloé Zhao, the film reimagines Shakespeare and Hathaway’s life following the tragic loss of their 11-year-old son, Hamnet. But portraying Hathaway was more than just a part for Buckley—it was a transformative learning experience.…