Answer: adriani

AnswerCrossword Clue
ADRIANI

Eighth-century pope in office for 23 years

ADRIANI

Pope during the reign of Charlemagne

ADRIANI

Eighth-century pope with the sixth-longest reign

ADRIANI
Eighth-century pope
ADRIANI
Pope who sought Charlemagne's aid
ADRIANIPope with the longest reign between St. Peter and Pius VI (A.D. 67-1799)