[2] The date of its establishment is unknown; its early status—a bishopric, a metropolitan archdiocese or an archbishopric without suffragan bishops—is obscure; its first (arch)bishop is uncertain; and its connection with the see of Bács (now Bač, Serbia) is debated.

[4] The cathedral church at Kalocsa was dedicated to Paul the Apostle who was renowned especially for his missionary activities.

[5] The patron saint implies that the see was established as a missionary bishopric, possibly aimed at the conversion of the so-called Black Hungarians (as it is proposed by historian Gábor Thoroczkay).

[5] One George was the first archbishop mentioned in a contemporaneous source: in 1050 or 1051 he was one of the prelates who assisted Pope Leo IX to celebrate a mass in Lotharingia.

The archbishops of Kalocsa were, from the 15th century to 1776, the perpetual counts (Hungarian: Bács vármegye örökös főispánja, Latin: Bacsiensis perpetuus supremus comes).