<Tr> <Td> Precursors (show) <Ul> <Li> Arnold of Brescia and Arnoldists </Li> <Li> Peter Waldo and Waldensians </Li> <Li> Girolamo Savonarola </Li> <Li> John Wycliffe and Lollardy </Li> <Li> William Tyndale </Li> <Li> Jan Hus and Hussites </Li> </Ul> </Td> </Tr> <Ul> <Li> Arnold of Brescia and Arnoldists </Li> <Li> Peter Waldo and Waldensians </Li> <Li> Girolamo Savonarola </Li> <Li> John Wycliffe and Lollardy </Li> <Li> William Tyndale </Li> <Li> Jan Hus and Hussites </Li> </Ul> <Li> Arnold of Brescia and Arnoldists </Li> <Li> Peter Waldo and Waldensians </Li>

What was the monumental crisis that caused the reformation