Pope Stephen IX
Pope · Religious Figures · Lived 1000 to 1058 · aged 58
The last pope to take the name Stephen, and one of three papal legates whose 1054 mission to Constantinople collapsed so catastrophically it split Christianity in two - permanently.
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A typical day, 30 days to 16 September 2026
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About this person
Born Frederick around 1020 into the Ardenne-Verdun family that ruled Lorraine, he began as a canon in Liège before Pope Leo IX brought him to Rome in 1051 and made him chancellor. In 1054 Leo sent him as one of three legates to negotiate with Patriarch Michael I Cerularius and Archbishop Leo of Ohrid in Constantinople; the talks failed and triggered the permanent East-West Schism. He stayed on as chancellor under Victor II and was elected abbot of Montecassino before the cardinals chose him pope on 2 August 1057. As Stephen IX he kept the Montecassino post, pushed the Gregorian Reform, and pressed Leo's campaign to drive the Normans out of southern Italy. He died in Florence on 29 March 1058 - apparently poisoned by Romans - while trying to engineer his brother Godfrey the Bearded's coronation as Holy Roman emperor.
