a throne that is the official chair of a bishop
The bishop's chair, or throne.
Bishop's throne in back of the Altar. The Amvon is also sometimes given this name.
A cathedra (Latin for "chair") is the chair or throne of a bishop. It is a symbol of teaching authority in the Roman Catholic Church and the Orthodox Church, and has in some sense remained such in the Anglican Communion and in Lutheran churches. Cathedra is the Latin word for a chair with armrests; its Roman connotations of authority reserved for the Emperor were adopted by bishops after the 4th century.