On 6 March 1948, de Castro was appointed
Coadjutor Bishop of
Campos and
titular bishop of Priene by
Pope Pius XII. He received his
episcopal consecration on 23 May from Archbishop
Carlo Chiarlo, Apostolic Nuncio to Brazil, with Bishop Ernesto de Paula and Archbishop
Geraldo de Proença Sigaud,
S.V.D., as
co-consecrators. He became bishop of Campos upon the death of Bishop Octaviano de Albuquerque on 3 January 1949. He was very active in opposing
liberation theology and communist infiltration of the Church and of his diocese. In 1956, de Castro opened the
Minor Seminary of the Diocese in the
village, now the
city, of
São Sebastião de Varre-Sai. In 1967, Dom Antônio obtained permission to operate the Major Seminary, with
Philosophy and
Theology courses (later transferred to Campos). In 1968, the Catholic conservative group
Tradition, Family and Property organized a campaign to collect signatures denouncing what were perceived as leftists in the Church. De Castro Mayer lent encouragement to the campaign. The
Episcopal Conference of Brazil later declared that TFP was neither recognized by the hierarchy nor considered an official Catholic organization. De Castro, a staunch
traditionalist, refused to implement the liturgical reforms of the
Second Vatican Council in his diocese. Until his resignation on 29 August 1981, the
Tridentine Mass continued to be celebrated throughout the Campos diocese, along with all the other traditional Catholic practices and devotions in Latin. Having submitted his resignation as required upon turning 75, he was replaced as bishop with the appointment of to succeed him on 29 August 1981. He continued his campaign against the Council's liturgical reforms in retirement and maintained a traditionalist "diocese" within the Campos diocese, with around 40,000 faithful, which he organized in parallel chapels. The total Catholic population of the diocese was 890,000. With Archbishop
Marcel Lefebvre, on 30 June 1988 de Castro
co-consecrated four bishops without papal authorization and incurred automatic
excommunication. He died of
respiratory failure in Campos on 25 April 1991. ==Notes==