The Antipope Silvester III reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Antipope Silvester III

Antipope Silvester III (or Sylvester). When Pope Benedict IX was driven from Rome early in January 1044, John, bishop of Sabina, was elected in his stead and took the title of Silvester III. Within three months Benedict returned and expelled his rival. Nearly three years later (December 1046) the council of Sutri deprived him of his bishoprics and priesthood. He was then sent to a monastery, where he seems to have died.

from the 9th edition (1887) of an unnamed encyclopedia.

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