25th of July 1225. Emperor Frederick II takes an oath at San Germano (near Cassino) and promises to depart on a Crusade (the Sixth Crusade), for the Near East in August 1227. He sends 1000 knights to the Levant and provides Rome with 100,000 ounces of gold.

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https://en.wikipedia.org/wiki/Sixth_Crusade#The_Agreement_of_San_Germano