Pope Donus II was a non-existent

pope The pope ( la, papa, from el, πάππας, translit=pappas, 'father'), also known as supreme pontiff ( or ), Roman pontiff () or sovereign pontiff, is the bishop of Rome (or historically the patriarch of Rome), head of the worldwide Cathol ...

who was at one time shown in the official lists of popes. He was mistakenly inserted after

Pope Benedict VI Pope Benedict VI ( la, Benedictus VI; died June 974) was the bishop of Rome and ruler of the Papal States from 19 January 973 to his death in 974. His brief pontificate occurred in the political context of the establishment of the Holy Roman Emp ...

. The name comes from a confusion of the title ''domnus'' (''dominus'') and the Roman name '' Donus'' (''LP'' II, XVIII, and 256).

References

Legendary popes {{pope-stub