Everything is put to the test with visual precision: a study of drapery for ... Ser Piero da Vinci, held elevated status as a notary—a professional path that Leonardo would have been expected ...

A rare portrait by Bernardino de’ Conti, a peer of Leonardo da Vinci, set a record at Sotheby's Master Paintings auction.

Both feature similar drapery and gold bands ... a classic technique employed by da Vinci. "Leonardo has worked on the painting, [and] I think it's important to recognize," Landrus said.