HILARIUS, or HILARUS (HILARY)  , bishop of Rome from 461 to 468, is known to have been a deacon and to have acted as legate of Leo the Great at the " robber " synod of Ephesus in 449 . There he so vigorously defended the conduct of Flavian in deposing Eutyches that he was thrown into prison, whence he had great difficulty in making his escape to Rome . He was chosen to succeed Leo on the Igth of November 461 . In 465 he held at Rome a council which put a stop to some abuses, particularly to that of bishops appointing their own successors . His pontificate was also marked by a successful encroachment of the papal authority on the metropolitan rights of the French and Spanish hierarchy, and by a resistance to the toleration edict of Anthemius, which ultimately caused it to be recalled . Hilarius died on the 17th of November 467, and was succeeded by Simplicius .