 It was a consequence (not necessarily intended) of the Savoy Conference of 1661.The Act of Uniformity prescribed that any minister who refused to conform to the "Book of Common Prayer" by St Bartholomew's Day (24 August) 1662 should be ejected from the Church of England.This date became known as 'Black Bartholomew's Day' among Dissenters, a reference to the fact that it occurred on the same day as the St Bartholomew's Day massacre of 1572.