Regesta Pontificum Romanorum ab condita ecclesia ad annum post Christum natum MCXCVIII. Tomus secundus (ab a. DCIV usque ad a. DCCCXLIV). Edited by Philipp JaffÉ. Third edition under the guidance of Nicolaus Herbers. Prepared by Waldemar Könighaus and Thorstan Schlauwitz with the assistance of Cornelia Scherer and Marcus SchÜtz
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