Entertainment Awards Shows and Events Film Festivals Why Kevin Costner Is Taking Sienna Miller and His Female Horizon Costars with Him to Cannes (Exclusive) Costner will debut his epic Western at the upcoming film festival By Mia McNiece Mia McNiece Mia McNiece joined PEOPLE in 2010 and is currently the Senior Movies Editor. People Editorial Guidelines Updated on May 2, 2024 04:27PM EDT Sienna Miller in Horizon: An American Saga: Chapter 1. Photo: Warner Bros. Pictures Kevin Costner will be bringing the female cast members from his epic Western, Horizon: An American Saga, when he attends the film's world premiere at the Cannes Film Festival on May 19. "I'm taking seven of the women that are in the movie with me," the two-time Academy Award winner, 69, tells PEOPLE of the film, which stars Sienna Miller, Jena Malone, Abbey Lee, Sam Worthington and Luke Wilson. "For Cannes, I really want to take these women who made a huge contribution to this movie." Costner directed, co-wrote and stars in the film that features several overlapping stories of ambitious settlers in the 19th century as they clash with Indigenous people — and each other. He says the film depicts the hardships the women faced during that time. Horizon: An American Saga: Chapter 1. Warner Bros. Pictures/YouTube Kevin Costner Says He Named Son Hayes, Who Makes Acting Debut in Horizon, After His Character in the Movie Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human-interest stories. "Women are the reason the country goes forward," he says. "They were taken often against their own wishes. They were taken advantage of and they were resilient. I couldn't tell the story unless it revolved around them." The saga will play out in four different films with the first two set to open in theaters on June 28 and Aug. 16. He says casting Miller, 42, was an easy decision for him. "I think she's one of our great actresses. Her outward beauty is undeniable, but she's so skilled as an actress," he says. "There's something about Sienna's character that I think speaks to all women." "Horizon is incredibly meaningful to me. It's really been the hardest thing I've ever done, but it's exactly what I want to do," Costner previously told PEOPLE in 2022. "A lot of times we measure ourselves against other generations," the Yellowstone star added when asked about why he’s drawn to the Western genre. "I think about what was at stake. How did people survive? There's a rawness and an unpredictability about it. I'm haunted by that." For more on Kevin Costner, pick up this week's issue of PEOPLE on newsstands Friday.