Catholic-Hierarchy.org
Catholic-Hierarchy.org is a privately run, long‑standing online database of current and historical information about Catholic bishops, dioceses (Latin and 23 Eastern Catholic Churches), cardinals, and related ecclesiastical structures. It is maintained by David M. Cheney since the late 1990s and is not officially sanctioned by the Church.
Sources
The site compiles data from public Vatican publications (Annuario Pontificio, Acta Apostolicae Sedis), Holy See press bulletins, historical studies, and contributions from researchers; Cheney updates it frequently and notes sources and revision dates on the site.
Usage
The database is widely used and cited by journalists, academic institutions, diocesan pages, and Catholic commentators, but because it’s an independent project users should treat it as a secondary (unofficial) reference and verify critical facts with primary Vatican or diocesan sources when necessary.