Meanwhile the crusade was postponed again and again; until under a threat of excommunication, after the fall of Damietta in 1221, Frederick definitely undertook by a treaty made at San Germano in 1225 to set out in August 1227 or to submit to this penalty.
The result was the treaty of San Germano, arranged in July 1230, by which the emperor, loosed from the ban, promised to respect the papal territory, and to allow freedom of election and other privileges to the Sicilian clergy.
Among the most important are: Richard of San Germano, Chronica regni Siciliae; Annales Placentini, Gibellini; Albert of Stade, Annales; Matthew Paris, Historia major Angliae; Burchard, Chronicon Urspergense.
In 1533 he left San Germano, and went to Rome, where he became tutor in the house of a Florentine gentleman named Galeotto Caccia.
Germano, Vita, gesti e predittioni del padre san Malachia (Naples, 1670); the ecclesiastical histories of Ireland by J.