H.G. Mor  Militheos Yuhanon was born in the Elavinamannil family of Manijinikkara on 25 April 1957 to Late Rev. E O. Thomas Cor- Episcopus and Thankamma. St Stephen’s Syriac Orthodox Church is his Parish. He was baptized by name Yuhanon. After his school education at Omallur.  H. G. took his U.G. and P. G. from Kerala University, in History. His basic theological education is from Mor Ignatius Dayro Manjinikkara. Later he joined Serampore university as an external student and obtained a Bachelor of Christian Studies (BCS). on 14 September 1976, at the age of 19, Yuhanon was ordained deacon by Catholicose Mor Baseliose Paulose II. Then Later he was ordained Dn. E. T. John Elavinamannil as Kassiso on 5 December 1982.

In 2000, Moran Mor Ignatius Zakka I Iwas, Prince Patriarch of Antioch and All the East appointed Fr. E. T. John Elavinamannil as Reesh Dayaro and Managing Trustee of Piramadom Dayaro. In the course of time, Malankara Episcopal Synod selected Fr. E. T. John as a new Metropolitan for Kollam and Thumpamon Dioceses. Moran Mor Ignatius Zakka I Iwas ordained him as Ramban and on 8 December 2002, as Metropolitan by the name Mor Militos at Patriarchal Cathedral, Damascus.  Now  Moran Mor Ignatius Aphrem II, Prince Patriarch of Antioch and All the East appointed H. G. as the Patriarchal Vicar of Australia, New  Zealand and Singapore.