The episcopal see was the town of Mottola, where the church of Santa Maria Assunta, also dedicated to Saint Thomas Becket, patron of the city, served as a cathedral.

"[3] The next Bishop of Mottola was Amuro, who in December 1100 confirmed for Abbot Orso of Santa Maria di Banzi his possession of the church of San Matteo in the territory of Castellaneta.

In that year Bishop Valcauso, who confirmed to the Abbot of Cava the possession of the monasteries of Sant'Angelo and of San Vito di Casalrotto, of some churches, lands and other goods.

Fourteen years after the death of Palmieri, a period in which the seat remained vacant, with the agreement (6 February 1818) between Pope Pius VII and Ferdinand I of Bourbon King of Naples, the diocese was suppressed and its territories were united to the diocese of Castellaneta .

[8] Gianfranco Gallone, newly appointed Apostolic Nuncio to Zambia and Malawi, has been the titular archbishop of Mottola since being consecrated a bishop on 19 March 2019.