Procerum" of the Abbas Domenicus
de Santis. Rome, 1675.
(All three are reproduced in the article in question.)
[2] The description of Prospero Colonna, given
by Pompilio Totti (in the above book)
tallies with our portrait.
[3] The accessories in the picture confirm the
identity—e.g. the St Andrew's Cross, or
saltire, is on the Colonna family banner;