Pab yr Eglwys Gatholig Rufeinig a rheolwr Taleithiau'r Babaeth o 12 Rhagfyr 1254[1] hyd ei farwolaeth oedd Alecsander IV (ganwyd Rinaldo di Jenne) (tua 1185 (cyn 1192)[1] – 25 Mai 1261).
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