Who invented All Soul's Day?

Answer 1

Catholic AnswerThe Commemoration of all the Faithful Departed (known as All Souls Day) is always on 2 November, the day after All Saints. "Rooted in ancient Christian tradition (2nd century and Tertullian), St. Odilo of Cluny (1 January) established a memorial of all the faithful departed in 988 A.D.. It was accepted in Rome in the 13 century." - from The Order of Prayer in the Liturgy of the Hours and Celebration of the Eucharist 2012, compiled by Rev. Peter D. Rocca, C.S.C., Paulist Press Ordo, Mahwah, NJ © 2011