Catholic missionaries entered the Mon area for the first time in 1980. Till then the district witness only a few casual visits of priests from Dibrugarh, Dimapur and Tuensang. One of the earliest priests to visit Mon was Fr. Thekkekuruvinal Chacko (T.J) of Tuensang. He had visited Mon from 5th –7th Oct 1970.On 10th June 1980, the first group of missionaries, Fr. Peter Bianchi and fr. Justin Lyngkhoi came to Mon, the district headquarters. Mr. Tinpong, the dobashi had agreed to give the house of the Angh of Daboka for rent but on reaching it was found to be already occupied by someone else. On 28th December 1980 the first group of sisters of Sacred Heart arrived in Mon to stay permanently.