Pentonville Prison is a large men's prison with a capacity of 1250 and was opened in 1842. Pentonville Prison is not actually within Pentonville itself, but is located further north, on the Caledonian Road in the Barnsbury area of the London Borough of Islington, in inner-North London, England. It is today a Category B/C prison, in other words not maximum security, but still high security at least in parts.