Frederick ii, king of sicily, swears an oath to pope honorius iii, in which he undertakes to protect and preserve the possessions of the roman catholic church, to defend the reign of sicily, and to confirm such engagements in the future, when crowned holy roman emperor. Given in haguenau, september 1219. Verso of a parchment with the gold seal of the frederick ii. The document is currently stored in the vatican secret archives. Date: 1 September 1219.
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