The Sixth Crusade, that of Frederick II., is described in the chronicle of Richard of San Germano, a notary of the emperor, and in other Western authorities, e.g.
These so-called " minority " nationalities were: Russians, Germano-Balts (Baits, Balto-Saxons), Jews, Lithuanians, Poles.
The percentage of literacy according to nationalities was: Germano-Balts 85, Esthonians 82, Poles 78, Letts 74, Jews 72, unknown 60, Lithuanians 55, Great Russians 36, others 33, White Russians 32.
His later years were spent in strife with his son Frederick, and he died in 1230 at San Germano, whither he had gone to arrange the peace between the emperor Frederick II.
And the emperor alike, he brought about the treaty of San Germano between them in 1230, was the only witness when they met in conference at Anagni in the same year, and it was he who, in 1235, induced Frederick's son, Henry, to submit to his father.
After the treaty of San Germano, which was made with Pope Gregory in 1230, and the consequent lull in the struggle with the Papacy, Frederick was able to devote some little attention to Germany, and in 1231 he sanctioned Rebellion the great Privilege of Worms. This was a reward to the princes for their efforts in bringing about the peace, and an extension of the concessions made in 1220.
On his return Frederick defeated the pontificals, and in 1230 peace was made at San Germano and the excommunication withdrawn.
Germano, Vita, gesti e predittioni del padre san Malachia (Naples, 1670); the ecclesiastical histories of Ireland by J.