
Guido, son of Count William of Burgundy and related to most of the royal houses of Europe, was Archbishop of Vienne and papal legate in France, where he led the opposition to Paschal II's forced concession on investiture. He was elected in February 1119, after Gelasius II died in exile, and crowned at Vienne.
He brought the long investiture struggle to an end with the Concordat of Worms in 1122, under which the emperor gave up investiture with ring and staff and allowed free Church elections; the First Lateran Council confirmed it in 1123. He also captured the antipope Gregory VIII, restored order in Rome, and made Santiago de Compostela a metropolitan see.
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