The Pope John XXI reference article from the English Wikipedia on 24-Apr-2004
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Pope John XXI

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John XXI, born Petrus Juliani or Petrus Hispanus (ca. 1210s - May 20, 1277), a Portuguese, was pope from 1276 until his death on May 20, 1277.

Note that the previous pope named John was Pope John XIX and there is no Pope John XX (see article for explanation)

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Preceded by:
Pope Adrian V
List of popes Succeeded by:
Pope Nicholas III