アルベルトゥス・マグヌス
The probable source for "HC SVNT DRACONES" on the Da Vinci and the Lenox Globe is the treatise . This treatise dating from 1276 contains a reference to the Orient by Albertus Magnus, who writes "", i.e. "where there are big dragons". Leonardo da Vinci makes reference to "" which means the secrets of Albertus Magnus in his Codex Madrid II, page 2 verso. The original passage by Albertus Magnus is: ". In English this means: "Draconites is namely a stone drawn out from the head of a dragon. This stone is brought from the Orient where there are many big dragons".