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In page History of the Republic of the Congo:

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Initially relations were limited and considered beneficial to both sides. With Christianity easily accepted by the local nobility, leading on 3 May 1491 to the baptism of king Nzinga a Nkuwu as the first Christian Kongolese king João I. He was succeeded after his death in 1506 by his son Nzinga Mbemba, who ruled as King Afonso I until 1543. Under his reign Christianity gained a strong foothold in the country. Many churches were built in Mbanza, of which the Kulumbimbi Cathedral (erected between 1491 and 1534) was the most impressive. In theory the kings of Portugal and Kongo were equals and they exchanged letters as such. Kongo at some point even established diplomatic relations with the Vatican, and the Pope appointed a local priest as bishop for the region.[citation needed]