It was only in the 12th century that the
Liber Pontificalis was systematically continued, although papal biographies exist in the interim period in other sources. and
Watterich attributed the biographies of Gregory VII, Victor III, and Urban II to
Petrus Pisanus, and the subsequent biographies to Pandulf. These biographies until those of
Pope Martin IV (1281–1285) are extant only as revised by Petrus Guillermi in the manuscripts of the monastery of St. Gilles having been taken from the Chronicle of
Martin of Opava. Early in the 14th century, an unknown author built upon the continuation of Petrus Guillermi, adding the biographies of popes
Martin IV (d. 1285) through
John XXII (1316–1334), with information taken from the "
Chronicon Pontificum" of
Bernardus Guidonis, stopping abruptly in 1328.
Boso Independently, the
cardinal-nephew of
Pope Adrian IV,
Cardinal Boso intended to extend the
Liber Pontificalis from where it left off with Stephen V, although his work was only published posthumously as the
Gesta Romanorum Pontificum alongside the
Liber Censuum of
Pope Honorius III. Boso drew on
Bonizo of Sutri for popes from
John XII to
Gregory VII, and wrote from his own experiences about the popes from
Gelasius II (1118–1119) to
Alexander III (1179–1181).
Western Schism An independent continuation appeared in the reign of
Pope Eugene IV (1431–1447), appending biographies from
Pope Urban V (1362–1370) to
Pope Martin V (1417–1431), encompassing the period of the
Western Schism. A later recension of this continuation was expanded under
Pope Eugene IV.
15th century The two collections of papal biographies of the 15th century remain independent, although they may have been intended to be continuations of the
Liber Pontificalis. The first extends from popes
Benedict XII (1334–1342) to
Martin V (1417–1431), or in one manuscript to
Eugene IV (1431–1447). The second extends from
Pope Urban VI (1378–1389) to
Pope Pius II (1458–1464). ==Editions==