 Charles was one of Leonardo's patrons, and the subject matter would suit what's known of him.The beeswax statuette, including black and white photographs, was first published as a work by Leonardo in 1987 in "The drawings and miscellaneous papers of Leonardo da Vinci" in "The collection of Her Majesty the Queen at Windsor Castle".The book was part of a series that Pedretti had taken over from Kenneth Clark, cataloging Leonardo's drawings stored in the Royal Collection in Windsor Castle.