[2][4][5][6] In Gregory's biography in the Liber censuum, he is described as an "experienced" military man (experate providentie virum cum militum).
[2] When the pope waged war on the Emperor Frederick II in 1228–1230, Gregory appointed Pandulf as his apostolic legate over the three armies and named him rector of Marittima e Campagna.
Resuming his advance in March, he took Gaeta, laid siege to Capua, took Alife and Telese, and joined up with the papal troops of Benevento.
[5] Advancing down the Garigliano, he met stiff resistance at Suessa, where he was replaced as legate by Cardinal Pelagius of Albano for reasons unknown.
[15] He continued the restoration of the cathedral of Anagni that had begun with the renovation of the floor in cosmatesque style by Cosimo between 1224 and 1227.
[16] The first record of the future Pope Boniface VIII is as a canon witnessing an act of Pandulf's on 16 October 1250.