The ancient tables* contain a linguistic historical misunderstanding, which doubled a generation of brothers, well established on the SAFE studies of sen. Oddone Colonna, di Palestrina
(which then also coincide in the studies of cardinal Giovanni Colonna) by Treccani.
*example of an ancient table: http://www.genmarenostrum.com/pagine-lettere/letterac/Colonna/COLON...
That said, Treccani identifies this
Landolfo Colonna (a BRO of the character studied)
progenitor of the future branch of Riofreddo.
On GENI I found this branch Landolfo Colonna, signore di Riofreddo,
kindly compiled by Antonio Moncada di Paternò, but unfortunately I have not found a link-source to investigate-study on my own without disturbing you :)
PLZ, who is receiving notification can kindly take a look & contribute to the information? TNX
