In the mid-1850s, the counties of Hertfordshire, Bedfordshire and Huntingdonshire set about looking for a site for a new asylum to house their 'pauper lunatics'. Two hundred acres of farmland at Stotfold on the Hertfordshire—Bedfordshire border were purchased and in March 1860 the first patients were admitted to the new Three Counties Asylum (TCA). The asylum was in operation for almost a century and a half and, as approaches to treating mental illness changed, so did TCA.