 The Apostolic Internuncio in India James Knox consecrated him on 5 February of the next year to the bishop ; co-consecrators were Albert Vincent D'Souza, Archbishop of Calcutta, and Raymond D'Mello, Bishop of Allahabad.Mathias attended the Second Vatican Council.On 12 September 1986, he was appointed Archbishop of Bangalore, a role in which he served until he resigned on 24 March 1998.