That Leonardo joined the guild before this time is deduced from the record of payment made to the Compagnia di San Luca in the company's register, Libro Rosso A, 1472–1520, Accademia di Belle Arti.
Että Leonardo liittyi kiltaan sitä ennen on päätelty Compagnia di San Lucan maksurekisteristä, Libro Rosso A, 1472–1520, Accademia di Belle Arti.