How a German Miller Sparked a Radical Religious Movement Through a Simple River Baptism

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: In 1708, a miller named Alexander Mack and seven followers performed a radical act: they baptized one another in the Eder River. This defiant rejection of infant baptism birthed the Schwarzenau Brethren, a movement that would soon flee European persecution to find a new home in the American colonies.

Born in 1679 in Schriesheim, Alexander Mack was initially a miller who followed the Reformed church. However, by 1705, he became deeply influenced by the Pietist movement led by Ernst Christoph Hochmann von Hochnau. This shift led Mack to host illegal Bible studies in his home, eventually forcing him to seek refuge in the village of Schwarzenau under the protection of Count Henrich Albrecht Sayn-Wittgenstein. This sanctuary was rare for the era, as most German rulers denounced such radical dissenters.

The movement solidified in 1708 when Mack and seven others—four men and three women—decided that believer's baptism was essential. Because they lacked an ordained minister to perform the rite, they used a lottery system to select who would baptize whom in the Eder River. This act defined their core tenets: a rejection of religious coercion, a commitment to strict pacifism, and the belief that the New Testament should serve as the sole creed and Rule of Faith. Mack himself was a noted Universalist.

Facing mounting pressure, the community eventually fractured. While a group led by Peter Becker emigrated to Pennsylvania in 1719, Mack moved his followers to Friesland in the Netherlands in 1720. The group struggled with poverty there, leading Mack to organize a voyage for about 30 families to Philadelphia in 1729. His arrival revitalized the American Brethren community, which had lost its momentum. Mack continued to serve as a pivotal leader until his death on 19 January 1735, after which the movement's vitality noticeably declined.

While historical records are clear on his impact, some details of his life remain subject to scholarly debate. For instance, while 27 July 1679 is often cited as his birthday, some researchers argue this date actually marks his baptism. Despite these minor historical ambiguities, Mack’s legacy as the founder of the Schwarzenau Brethren remains a significant chapter in the history of religious dissent and the migration of faith communities to the New World.

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