The Roman Catholic Diocese of Wilmington is an ecclesiastical territory or diocese of the Roman Catholic Church in the eastern United States and is comprised of the entire state of Delaware. It is led by a prelate bishop which serves as pastor of the motherchurch, Cathedral of Saint Peter in the City of Wilmington.
The diocese was canonically erected on March 3, 1868 by Pope Pius IX. It took its territories from the Archdiocese of Baltimore and the former Diocese of Philadelphia .
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