The Diocese of Cava was established on 7 August 1394 (centered on the monastery of La Trinità della Cava), on territory split off from the Metropolitan Archdiocese of Salerno.
[3] To ease the transition, the Abbot of Cava, Liguori Majorini, was named Archbishop of Salerno, and in the vacancy the first bishop, Francesco d'Aiello, was appointed.
[6] On 7 December 1833, in the Bull In vinea Domini, Pope Gregory XVI restored the diocese of Nocera de’ Pagani, and assigned it the territory which it had lost fifteen years earlier to the diocese of Cava.
In 1972 its personal union[clarification needed] with Sarno was ended.
Cava de Tirreni merged with the Metropolitan Archdiocese of Amalfi as Roman Catholic Archdiocese of Amalfi-Cava de' Tirreni, while the territory of the former diocese of Sarno merged with the restored diocese of Nuceria Paganorum to form the diocese of Nocera Inferiore-Sarno.