VATICAN CITY (AP) - The pope named Bishop Gerhard Ludwig Mueller to head the Vatican's all-important orthodoxy office Monday, tapping a German theologian like himself to head the congregation he presided over for nearly a quarter-century enforcing Catholic doctrine.

The 64-year-old Regensburg bishop replaces American Cardinal William Levada, who turned 76 last month and is retiring after seven years at the helm of the Congregation for the Doctrine of the Faith, the former Holy Office.

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