In 1438, Pope Eugene IV sent the inquisitor Giacomo della Marca to Slavonia as a missionary to baptize "schismatic" Serbs in "Roman religion", and if that failed, to banish them.

[2] Since the renewal of the Serbian Patriarchate of Peć in 1557, the Orthodox Serbs of Lower Slavonia were placed under the jurisdiction of the Eparchy of Požega, centered at the Orahovica Monastery.

[3] In 1595, the Serbian Orthodox metropolitan Vasilije of Požega moved to Upper Slavonia, under Habsburg rule, in order to avoid Turkish oppression.

After his death and several years of administration, the Eparchy of Lepavina was abolished, and in 1750 its territory came under the jurisdiction of the Serbian Orthodox bishops of Kostajnica.

[4] The first Eastern Orthodox Metropolitan of Zagreb was Dositej Vasić, a learned theologian and man of broad vision and understanding in relations with other nations and religions.

In spite of that, after the Nazi occupation of Yugoslavia in World War II and the creation of the Independent State of Croatia (1941), he was arrested and tortured.

After World War II, the Zagreb metropolitanate and other dioceses in the territory of Croatia were administered by auxiliary (vicarian) bishop Arsenije Bradvarević.

[6] Metropolit Jovan organized the meeting of Serbian Patriarch Pavle and Cardinal Franjo Kuharić (first in the spring of 1991 in Sremski Karlovci, and the other later in Slavonski Brod).