I’ve written an article on the £100000 tax on Catholics in the September issue of BBC History Magazine. This was the measure that prompted the imposition of the oaths to George I in 1723. The effectiveness of the tax has been debated by historians but in this short piece I argue that it did reveal the capacity of the state to keep watch on its Roman Catholic subjects (whether rich or poor, male or female). You can download a copy of the article from the link below. I’m grateful to BBC History Magazine for permission to reproduce my essay.