Question: When does an Anabaptist leader born who led the schism in Switzerland within a group of Swiss and Alsatian Anabaptists? 
Context: The Martyrs' Synod took place in Augsburg, Germany, from 20 to 24 August 1527.  The purpose of this meeting, attended by about sixty representatives from different Anabaptist groups, was to come to agreement over the differences related to the central Anabaptist teachings among the Swiss and south German Anabaptists. Bernhard (or Bernard) Rothmann (c. 1495 – c. 1535) was a 16th-century Reformer and an Anabaptist leader in the city of Münster (modern Germany).  He was born in Stadtlohn, Westphalia, around 1495. The Amish ( ; Pennsylvania German: "Amisch", German: "Amische" ) are a group of traditionalist Christian church fellowships with Swiss Anabaptist origins.  They are closely related to, but distinct from, Mennonite churches.  The Amish are known for simple living, plain dress, and reluctance to adopt many conveniences of modern technology.  The history of the Amish church began with a schism in Switzerland within a group of Swiss and Alsatian Anabaptists in 1693 led by Jakob Ammann.  Those who followed Ammann became known as Amish. The Schleitheim Confession was the most representative statement of Anabaptist principles, endorsed unanimously by a meeting of Swiss Anabaptists in 1527 in Schleitheim (Switzerland).  The meeting was chaired by Michael Sattler.  Michael Sattler was the leader of the Swiss and southern German Anabaptist movement.  Shortly after the Schleitheim conference, Sattler was arrested by Austrian Roman Catholic authorities, and put on trial along with a number of other Anabaptists; he was found guilty and was executed.  The South German Ordnung of approximately the same date is similar to that of the Schleitheim Confession but contains many more Biblical references supporting the confession. Jakob Ammann (also Jacob Amman, Amann) (12 February 1644 – between 1712 and 1730) was an Anabaptist leader and namesake of the Amish religious movement. John of Leiden (Dutch: "Jan van Leiden" ; also "Jan Beukelsz", "Jan Beukelszoon", "John Bockold", "John Bockelson"; February 2, 1509January 22, 1536), was an Anabaptist leader from Leiden, in the Holy Roman Empire's County of Holland.  In 1533 he moved to Münster, the capital city of the Holy Roman Empire's Prince-Bishopric of Münster, where he became an influential prophet and a leader of the Münster Rebellion.  He turned Münster, the city, into a millenarian Anabaptist theocracy, and proclaimed himself "King of Münster" in 1534.  In 1535, the insurrection was suppressed after a siege of the fortified city, and John was captured, tortured and executed. Balthasar Hubmaier, also Hubmair, Hubmayr, Hubmeier, Huebmör, Hubmör, Friedberger, Latin: Pacimontanus (c. 1480 10 March, 1528) was an influential German/Moravian (Schwertler) Anabaptist leader.  He was one of the most well-known and respected Anabaptist theologians of the Reformation. Marietje Jan de Gortersdochter (died 21 February 1539) was a Dutch Anabaptist.  She is known in history as a martyr of the Anabaptist faith and the mother of the Anabaptist leader David Joris.  She was married to the merchant Joris van Amersfoort and mother of David Joris.  She was executed by decapitation in Delft after banned books had been among her possessions. Melchior Rink was a central-German Anabaptist leader during the sixteenth-century.  He participated in the German Peasants' War of 1525, and was accused by Lutherans of being an instigator of the war, propagating rebaptism, teaching that there should be no civil authority, and encouraging communities to dismiss their magistrates.  Rink resented these accusations.  According to his own followers he preached non-resistance to the persecutions the Anabaptists faced, and that he asked his follows to obey magistrates so long as they did not demand action against God's law. Andreas Fischer (ca. 1480 – 1540) was an Austrian/Moravian Anabaptist, and associate of Oswald Glaidt.  He first appears as an Anabaptist leader in the public records in 1528 in Silesia, as a literary opponent of Caspar Schwenckfeldt's associate, Valentine Crautwald.  His main written work is "Scepastes Decologi," in which he defended not only adult baptism but also (following Oswald Glaidt) the reinstitution of Saturday/Sabbath keeping as a Christian practice.  This work is lost, but its main arguments are carefully reconstructed by Daniel Liechty (pp54ff.)  based on Crautwald's tract against it ("Bericht und anzaigen wie gar one kunst und guether versandt, Andreas Fischer Vom Sabbat geschriben.")  Fischer spent the 1530s moving back and forth between Silesia, Moravia and Slovakia, where he found fertile ground for his ideas especially among the population of miners, who were staging a series of strikes and revolts throughout that decade.  Fischer was arrested and put to death in 1540.
Answer: 12 February 1644