Gregory IX; Pope (1227-42); formerly Cardinal Ugolino; Count of Segni; Anagni around 1160 - Rome 22.8.1241.- Confirmation certificate for the chapter of the Zeitz collegiate church; Viterbo; 3rd January 1236: Pope Gregory IX confirms the chapter of the collegiate foundation Zeitz on the agreement reached at the church meeting in Merseberg in February 1230 between the Naumburg cathedral chapter and the chapter of the Zeitz collegiates in the controversery about the rank of both institutions. -On parchment; height 27 cm; width 30.5 cm; plica 3 cm.With seal of Gregory IX; lead bull on red-yellow silk thread; diameter 4 cm.Urk. No. 8a.Naumburg; Vereinigte Domstifter.