LOS ANGELES, May 9 (Reuters) King Arthur's knights rode out of the pages of legend and onto Hollywood Boulevard on Monday, as director Guy Ritchie's new film "King Arthur: Legend of the Sword" charting the exploits of the legendary British ruler held its world premiere. "Pacific Rim" star Charlie Hunnam plays Arthur in Ritchie's gritty, action-packed take on the tale. Hunnam's Arthur is an orphaned street urchin, who must fight to claim his throne from his uncle Vortigen - played by Jude Law - who murdered his parents. The film hits US cinemas on May 12. "If you are going to tell a story that has been told before you have to come in with a vision that makes it original and fresh," Hunnam told reporters at the premiere. "We thought it was more interesting to make him an everyman just like you or I." REUTERS PY 1636