The diocese of Idukki was erected by His Holiness Pope John Paul II bifurcating the diocese of Kothamangalam. The bull of creation Maturescens Catholica Fides was promulgated on 19-12-2002, the declaration was on 15-01-2003 and the Eparchy was inaugurated on 02-03-2003. The eparchy is dedicated to MAR SLIBHA. The name of the district 'Idukki' is supposed to be derived from the Malayalam word 'idukku' which means a narrow gorge. The river Periyar, which is one of the largest rivers of Kerala, is flowing through Idukki and the gorge formed between the two high massive hills called "Kuravan" and "Kurathi", is the site of the gigantic Idukki Arch Dam.