Pope Gregory X
Reigned from 1 September 1271 to 20 January 1276.
Born in 1210 in Piacenza, Italy as Teobaldo Visconti; died on 20 January 1276 at Arezzo, Italy.
After the death of Pope Clement IV in 1268, the Holy See was vacant for nearly three years.
Finally the archdeacon of Liege, though not yet a priest, was elected in 1271.
He was ordained and consecrated in 1272.
The outstanding event of his reign was the convocation of the Council of Lyons, in which he effected a temporary union with the Greeks, sought to restore peace between the Guelphs and Ghibellines in Tuscany and Lombardy, and made plans for a crusade to lighten the oppression of Christians in Palestine.
He crowned Rudolf of Hapsburg as emperor.
Because of his great virtue, he is revered as a saint in Rome and in a number of Italian dioceses.
New Catholic Dictionary