Sentence:  Eche day there etyn in his court xii erchebeshopis and xx bishopis, and the patriak of Seynt Thomays is as here <WSD>pope</WSD>. 
Meaning of the word marked with <WSD> tags:  A theocrat, a priest-king, including (at first especially) over the imaginary land of (Prester John) or (now) in figurative and alliterative uses.