The confinement of married women by their husbands in their homes or in private madhouses was an issue which caused much concern in eighteenth-century England, but which has been little explored by historians. This article uses the records of the court of King's Bench, a source which has been previously neglected by historians of marriage, to explore the circumstances of this form of marital abuse. It shows that within eighteenth-century English law there was much uncertainty about the ‘right’ of husbands to confine their wives, and that this allowed some men to test the limits of their authority. It argues that although some women were able to adopt legal and extra-legal strategies in response to confinement, changing notions of ideal femininity shaped the ways in which women were able to respond to marital abuse, and left genteel women peculiarly vulnerable to accusations of madness and to subsequent confinement in a madhouse.