404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F17143383%2Fleonard_sonnes%2F&title=L%C3%A9onard+Sonnes+%281692-1757%29 was not found on this server. That’s all we know.