Giacomo Colonna (cardinal)

Giacomo or Jacopo Colonna (1250 – 14 August 1318) was a member of a powerful noble family in Rome, and an Italian cardinal.

In 1288, Pope Nicholas IV named Giovanni's son, Pietro Colonna, a cardinal.

They appealed to Pope Boniface, who ordered Giacomo to return the land, and furthermore hand over the family's strongholds of Colonna, Palestrina, and other towns to the Papacy.

The Colonna family (aside from the three brothers allied with the Pope) declared that Boniface had been elected illegally following the unprecedented abdication of Pope Celestine V. The dispute led to open warfare, and in September, Boniface appointed Landolfo to the command of his army, to put down the revolt of Landolfo's own Colonna relatives.

[5] After the death of Boniface VIII, Pietro and Giacomo were excluded from participation in the election of a successor due to the excommunications that were imposed on them.