Most people know John Wayne for his cowboy persona. But there was much more to the Duke than that famous swagger. Here are a few facts about Duke that might surprise you.

1. A BODY SURFING ACCIDENT CHANGED HIS CAREER. 

John Wayne, surfer? Yep—and if he hadn’t spent a lot of time doing it, he may never have become the legend he did. Like many USC students, Wayne (then known as Marion Morrison) spent a good deal of his extracurricular time in the ocean. After he sustained a serious shoulder injury while bodysurfing, Morrison lost his place on the football team. He also lost the football scholarship that had landed him a spot at USC in the first place. Unable to pay his fraternity for room and board, Morrison quit school and, with the help of his former football coach, found a job as the prop guy at Fox Studios in 1927. It didn’t take long for someone to realize that Morrison belonged in front of a camera; he had his first leading role in The Big Trail in 1930.

2. HE TOOK HIS NICKNAME FROM HIS BELOVED FAMILY POOCH. 

Marion Morrison had never been fond of his feminine-sounding name. He was often given a hard time about it growing up, so to combat that, he gave himself a nickname: Duke. It was his dog’s name. Morrison was so fond of his family’s Airedale Terrier when he was younger that the family took to calling the dog “Big Duke” and Marion “Little Duke,” which he quite liked. But when he was starting his Hollywood career, movie execs decided that “Duke Morrison” sounded like a stuntman, not a leading man. The head of Fox Studios was a fan of Revolutionary War General Anthony Wayne, so Morrison’s new surname was quickly settled. After testing out various first names for compatibility, the group decided that “John” had a nice symmetry to it, and so John Wayne was born. Still, the man himself always preferred his original nickname. “The guy you see on the screen isn’t really me,” he once said. “I’m Duke Morrison, and I never was and never will be a film personality like John Wayne.”

3. HE WAS A CHESS FANATIC. 

Anyone who knew John Wayne personally knew what an avid chess player he was. He often brought a miniature board with him so he could play between scenes on set.

When Wayne accompanied his third wife, Pilar Pallete, while she played in amateur tennis tournaments, officials would stock a trailer with booze and a chess set for him. The star would hang a sign outside of the trailer that said, “Do you want to play chess with John Wayne?” and then happily spend the day drinking and trouncing his fans—for Wayne wasn’t just a fan of chess, he was good at chess. It’s said that Jimmy Grant, Wayne’s favorite screenwriter, played chess with the Duke for more than 20 years without ever winning a single match.

Other famous chess partners included Marlene Dietrich, Rock Hudson, and Robert Mitchum. During their match, Mitchum reportedly caught him cheating. Wayne's reply: "I was wondering when you were going to say something. Set 'em up, we'll play again."

4. HE COINED THE TERM "THE BIG C."

If you say you know someone battling “The Big C” these days, everyone immediately knows what you’re referring to. But no one called it that before Wayne came up with the term, evidently trying to make it less scary. Worried that Hollywood would stop hiring him if they knew how sick he was with lung cancer in the early 1960s, Wayne called a press conference in his living room shortly after an operation that removed a rib and half of one lung. “They told me to withhold my cancer operation from the public because it would hurt my image,” he told reporters. “Isn’t there a good image in John Wayne beating cancer? Sure, I licked the Big C.”

Wayne's daughter, Aissa Wayne, later said that the 1964 press conference was the one and only time she heard her father call it “cancer,” even when he developed cancer again, this time in his stomach, 15 years later. Sadly, Wayne lost his second battle with the Big C and died on June 11, 1979 at the age of 72.