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The papal election of 26 May to 29 August 1261, took place after the death of Pope Alexander IV on May 25, and chose Pope Urban IV as his successor. Since Pope Alexander had been resident in Viterbo since the first week of May, 1261, the meeting of the cardinals to elect his successor took place in the Episcopal Palace at Viterbo, which was next to the Cathedral of S. Lorenzo. The actual date of the beginning of the Electoral Meeting (there were, as yet, no Conclaves) is unknown.
^Cristofori, pp.217-275, and, for the tomb of Alexander IV, pp. 277-285.
^Annales Sancti Justinae Patavini in G. Pertz (Editor), Monumenta Germaniae Historica Scriptorum Volume XIX, p. 181): Iste toto tempore sui regiminis nullum constituit cardinalem; nam cum quidam de cardinalibus edificare Syon in sanguinibus affectaret, quidam vero vellent viros ydoneos promovere, ipse licet haberet plenitudinem potestatis, timore tamen scandali neutram partem voluit exaudire. Sede Vacante of 1261 (Dr. J. P. Adams).
^B. Hauréau Quelques lettres d' Innocent IV (Paris 1874) (Extrait from Notices et Manuscrits XXIV.2), 48-79.