The Utraquist Church of Bohemia was unique among the late medieval defections in Western Christendom from the Church of Rome in that it involved the separation of an entire church, organized on a national territory, not merely an underground resistance of relatively isolated and scattered groups of sectarians, like the Waldensians or the Lollards. Moreover, the Bohemian Reformation was linked with a major social upheaval, the Hussite Revolution, lasting from 1419 to 1434, which historians have viewed as an early specimen, if not a prototype or the first link in the chain, of the revolutions of the early modern period in the Euroatlantic world: the Dutch, the English, the American, and the French revolutions. Building mainly on the Bohemian Reform movement that had gathered momentum since the mid-fourteenth century, the Utraquists' defiance of Rome, leading to the Hussite Revolution, was sparked by the burning of Jan Hus at the Council of Constance on July 6, 1415.