The diocese was established on 13 March 1776 as a suffragan of the Archdiocese of Esztergom. On 30 December 1977, it was taken from the former and became part of the newly created Slovak ecclesiastical province with metropolitan being the Diocese of Trnava, which was renamed on 31 March 1995 to the Archdiocese of Bratislava-Trnava. It covers western and central parts of the Banská Bystrica Region, eastern parts of the Trenčín Region and southern central parts of the Žilina Region. It covered an area of 5,424 km2 with 590,494 people of which 62% were of Catholic faith (2006).[3]
On 14 February 2008, as a part of the changes in Slovak dioceses, the diocese lost area around Martin to the newly created Diocese of Žilina and territory around Brezno to Diocese of Rožňava. On the other hand, it gained former eastern areas of the Archdiocese of Bratislava-Trnava (from Banská Štiavnica to Šahy and Veľký Krtíš) (see e.g. this map (in Slovak), and some other border changes occurred as well.
Appointed coadjutor bishop on 14 June 1941. Dr. Škrábik was a university professor of theology, a judge of the ecclesiastical court, and an author of polemical work in defense of the Catholic Church and religion. During the Second World War, he used the seminary and the episcopal residence to hide many political exponents.[citation needed] Together with Dr. John Balk is credited with the rescue of ten people.[citation needed]