The Metropolitanate of Zagreb and Ljubljana is an Eastern Orthodox eparchy (diocese) and one of the five honorary metropolitanates of the Serbian Orthodox Church. The headquarters of the metropolia is located in Zagreb, Croatia, and its jurisdiction covers northern Croatia and the entire territory of Slovenia.

Katarina Branković, also known as Kantakuzina was the Countess of Celje, through the marriage with Count of Celje Ulrich II. A Serbian princess, she was the daughter of Despot Đurađ Branković and Byzantine princess Irene Kantakouzene. She is remembered for writing the Varaždin Apostol (1454), and her endowment of the Rmanj Monastery.