https://en.wikipedia.org/wiki/Colonna_family
History Origins. According to tradition, the Colonna family is a branch of the Counts of Tusculum — by Peter (1099–1151) son of Gregory III, called Peter "de Columna" from his property the Columna Castle in Colonna, in the Alban Hills.Further back, they trace their lineage past the Counts of Tusculum via Lombard and Italo-Roman nobles, merchants, and clergy through the …