The Pope Gregory X reference article from the English Wikipedia on 24-Apr-2004
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Pope Gregory X

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Gregory X, born Theobald Visconti (ca.. 1210 - January 10, 1276), pope from 1271 to 1276, succeeded Clement IV after the papal chair had been three years vacant; his election occurred while he was engaged in a pilgrimage to Saint Jean d'Acre. On his arrival at Rome his first act was to summon the council which met at Lyons in 1274 for the purpose of considering the Easter schism, the condition of the Holy Land, and the abuses of the Catholic Church. It was while returning from that council that he died at Arezzo on the January 10, 1276. To him is due the bull which, subsequently incorporated into the code of canon law, continues to regulate all conclaves for papal elections. He was succeeded by Innocent V.


from the 9th edition (1880) of an unnamed encyclopedia

Preceded by:
Pope Clement IV
List of popes Succeeded by:
Pope Innocent V