The idea that Mojmir I was baptized between 818 and 824 is based on indirect evidence, namely on the dating of a Christian church in Mikulčice (Czech Republic) to the first quarter of the 9th century. Although this idea is still a matter of scholarly debate, the "History of the Bishops of Passau" recorded a mass baptism of the Moravians in 831 by Bishop Reginhar of Passau. Even so, the pagan sanctuary in Mikulčice continued in uninterrupted use until the middle of the 9th century.