Carole Horst Aidan Turner already has legions of fans for his turn as Kili in “The Hobbit” feature film series and earned a whole lot more — in a different demographic — as Ross Poldark in the long-running BBC series “Poldark,” a fixture on PBS’ “Masterpiece” in the States. Now he’s bringing his gift for period drama and his Renaissanceera hair to “Leonardo,” an eight-episode drama that probes the inner life of the Renaissance genius Leonardo da Vinci and is a joint effort from Italy’s RAI, France Télévisions, Germany’s ZDF and Spain’s RTVE.
