This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
In 1457, followers of the reformer Jan Hus, executed as a heretic at the Council of Constance more than three decades earlier, gathered at Kunvald in eastern Bohemia and organized themselves as the Unity of the Brethren. Hus himself had never founded a separate church; the Brethren who took his name did what he had not lived to do, building an organized body around the reforms he had preached and died for.
The Brethren who met at Kunvald acted decades before Martin Luther nailed his own theses to the door at Wittenberg, roughly sixty years ahead of the reformation that would eventually give Protestantism its name across the rest of Europe. Their movement grew out of Hus's own teaching and out of the wider Hussite unrest that had followed his death, but it took the deliberate step his followers had not yet taken of forming a distinct organized body rather than remaining a current within the existing church.
What the 1457 founding changed for the Brethren's spread was priority itself. An organized Protestant movement existed in Bohemia before the word Protestant had any European meaning, and the body founded at Kunvald carried Hus's reforms forward for more than a century and a half, through repression and revival, until the 1620 defeat that would eventually drive it underground and scatter it across Moravia and Poland.