404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F16296167%2Fjean_stuart%2F&title=Jean+Stuart+%28duc+d%27Albany%2C+1481%3F-1536%29 was not found on this server. That’s all we know.