Gregory IV,
pope (827-844), was chosen to succeed
Valentinus in December 827, on which occasion he recognized the supremacy of the
Frankish emperor
Louis the Pious in the most unequivocal manner. His name is chiefly associated with the quarrels betweeen
Lothair I and
Louis the Debonaire, in whom he espoused the cause of the former, for whom, in the
Campus Mendacii, or "field of lies" as it is usually called (833), he secured by his treachery a temporary advantage. The institution of the feast of All Saints is usually attributed to this pope. He died January 25, 844, and was succeeded by
Sergius II.
from the 9th edition (1880) of an unnamed encyclopedia
- preceded by Pope Valentinus (827)
- succeeded by Pope Sergius II (844-847)