When he was a little boy, British filmmaker Jim Greayer wanted to be a medieval knight. “Sometimes when my sisters just wanted to go to the beach or lie by the pool, we’d go off and visit a monastery on a hill, or something like that,” he says. “I was always keen to put myself in the shoes of the people and see it through the eyes of the people back then, just imagine what it would be like to be a monk or a knight or something like that — just try to fill in the blanks of the landscape and bring those ruins back to life,” he says. Visiting castles and monasteries and abbeys with his mom sparke…