"There has long been a need for a modern, scholarly study of Alexander Henderson, the most important clerical leader of the Scottish Covenanters. Charles Jackson's carefully researched work helps us to understand why Henderson was so effective and why his death in 1646 was such a loss to the Covenanter movement. The book engages with a number of debates among historians and highlights the importance of religion in Covenanter ideology. It will be of particular interest to students of the British Civil Wars, presbyterianism, and the Reformed tradition." John Coffey, professor of early modern history, University of Leicester