CELESTINE IV. (Godfrey Castiglione), pope in 1241, nephew of Urban III. (1185-87), was archpriest and chancellor at Milan, before he joined the Cistercians. In 1227 Gregory IX. created him cardinal priest, and in 1233 cardinal bishop of Sabina. Elected to succeed Gregory on Oct. 25, 1241, he died on Nov. Io before consecration.
See A. Potthast, Regesta Pontificum Romanorum, vol. i. (1874), 940 f.