Roman Catholic Diocese of Des Moines

The Diocese of Des Moines is the Roman Catholic diocese for the southwestern quarter of the U.S. state of Iowa. It is a suffragan see of the Archdiocese of Dubuque. The See city for the diocese is Des Moines. The cathedral parish for the diocese is St. Ambrose. Currently Bishop William Michael Joensen is the bishop of the diocese.

Like other American dioceses, the area that makes up the present diocese was under the jurisdiction of a number of prelates. Most of these were purely academic because of no actual Catholic presence in the area. In the 19th century, the area came under the jurisdiction of the Bishop of Saint Louis Joseph Rosati. It was under his jurisdiction that the first permanent Catholic presence came to what would be the state of Iowa.

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