The Diocese of Terlizzi (Latin: "Dioecesis Terlitiensis") was a Roman Catholic diocese located in the town of Terlizzi the region of Apulia in southern Italy, in the province of Bari, lying to the west of the seaport of Bari on the Adriatic Sea. The diocese of Giovinazzo, which included the town ("oppidum") of Terlizzi, was erected in the 11th century.
History.
In 1749, the diocese of Terlizzi was established, and was united with the Diocese of Giovinazzo, to form the Diocese of Giovinazzo e Terlizzi.
After Napoleon.
Following the extinction of the Napoleonic Kingdom of Italy, the Congress of Vienna authorized the restoration of the Papal States and the Kingdom of Naples. Since the French occupation had seen the abolition of many Church institutions in the Kingdom, as well as the confiscation of most Church property and resources, it was imperative that Pope Pius VII and King Ferdinand IV reach agreement on restoration and restitution. 
A concordat was finally signed on 16 February 1818, and ratified by Pius VII on 25 February 1818. Ferdinand issued the concordat as a law on 21 March 1818. The right of the king to nominate the candidate for a vacant bishopric was recognized, as in the Concordat of 1741, subject to papal confirmation (preconisation). On 27 June 1818, Pius VII issued the bull "De Ulteriore", in which, among many other things, he dealt with dioceses which had been directly subject to the Holy See. The decision was made to suppress permanently the united dioceses of Giovenazzo and Terlizzi, once the current incumbent had vacated the seats, and to incorporate the two dioceses into the diocese of Molfetta.
On 4 March 1836, Pope Gregory XVI, in the bull "Aeterni Patris", united the dioceses of Giovenazzo and Terlizzi with the diocese of Molfetta. It was determined that there would be only one priestly seminary for the three dioceses, in Molfetta. Molfetta remained directly subject to the Holy See.
References.
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