 He published a large number of declarations and discourses, mostly in Dutch, enumerated in Sibley's biography, and wrote also "A True Relation of the Progress of the Parliament's Forces in Scotland" (1651), Thomason Tracts, Brit.Mus., E 640 (5).His wife, Frances, died 10 July 1683, and he died in Cambridge just over a year later, around 19 July 1684, when his will was proved, after having acquired a substantial fortune, and was considered to be the largest landowner in Cambridgeshire (critics claimed he amassed the fortune partly through his exceptional meanness about money).