Answer: adriani

AnswerCrossword Clue
ADRIANIEighth-century pope in office for 23 years
ADRIANIPope during the reign of Charlemagne
ADRIANIEighth-century pope with the sixth-longest reign
ADRIANIEighth-century pope
ADRIANIPope who sought Charlemagne's aid
ADRIANIPope with the longest reign between St. Peter and Pius VI (A.D. 67-1799)