The Da Vinci Notebooks
Occasional references to the Sforza monument (719-724).Again, the bronze horse may be taken in hand, which is to be to the immortal glory and eternal honour of the happy memory of the prince your father, and of the illustrious house of Sforza.
14:342 : The letter from which this passage is here extracted will be found complete in section XXI. (see the explanation of it, on page 2).