- Catholic Encyclopedia: Hierarchy of the Early Church
 - Article discusses the hierarchy used to denote the three grades of bishop, priest, and deacon in the early church. - Catholic Encyclopedia: Hierarchy
- Provides the history of the Catholic Church's hierarchy of order and jurisdiction.
- Catholic Pages: Hierarchical Structure of the Church
- Explains the hierarchy of the church as an apostolic succession, stemming from Peter, head of the apostles, or disciples of Christ.
- Hierarchical Constitution of the Church
- Brief article describes the history of the Catholic Church's hierarchy.
- Hierarchy of the Catholic Church
- Current and historical information about its bishops and dioceses.
- Roman Catholic Church Hierarchy
- Brief description of the Catholic clergy, which is organised in a strict, sometimes overlapping hierarchy: priest, cardinal, archbishop, bishop, priest, and deacon.
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