HM Prison Pentonville is a Category B/C

Prison security categories in the United Kingdom

There are four prisoner security categories in the United Kingdom used to classify every adult prisoner for the purposes of assigning them to a prison. The categories are based upon the severity of the crime and the risk posed should the person escape....

 men's prison

Prison

A prison is a place in which people are physically confined and, usually, deprived of a range of personal freedoms. Imprisonment or incarceration is a legal penalty that may be imposed by the state for the commission of a crime...

, operated by Her Majesty's Prison Service

Her Majesty's Prison Service

Her Majesty's Prison Service is a part of the National Offender Management Service of the Government of the United Kingdom tasked with managing most of the prisons within England and Wales...

. Pentonville Prison is not actually within Pentonville

Pentonville

Pentonville is an area of north-central London in the London Borough of Islington, centred on the Pentonville Road. The area is named after Henry Penton, who developed a number of streets in the 1770s in what was open countryside adjacent to the New Road...

 itself, but is located further north, on the Caledonian Road

Caledonian Road (London)

The Caledonian Road, in Islington, North London is a road, about one and half miles long, running north-south from Camden Road near the junction with Holloway Road to Pentonville Road in the south. It is often known colloquially as the "Cally" and forms the entirety of the A5203.The street is...

 in the Barnsbury

Barnsbury

Barnsbury is an area of north London in the London Borough of Islington, in the N1 postal districts.The name is a corruption of villa de Iseldon Berners , being so called after the Berners family: powerful medieval manorial lords who gained ownership of a large part of Islington after the Norman...

 area of the London Borough of Islington

London Borough of Islington

The London Borough of Islington is a London borough in Inner London. It was formed in 1965 by merging the former metropolitan boroughs of Islington and Finsbury. The borough contains two Westminster parliamentary constituencies, Islington North and Islington South & Finsbury...

, in inner

Inner London

Inner London is the name for the group of London boroughs which form the interior part of Greater London and are surrounded by Outer London. The area was first officially defined in 1965 and for purposes such as statistics, the definition has changed over time. The terms Inner London and Central...

-North London

North London

North London is the northern part of London, England. It is an imprecise description and the area it covers is defined differently for a range of purposes. Common to these definitions is that it includes districts located north of the River Thames and is used in comparison with South...

, England.
The first modern prison in London, Millbank

Millbank Prison

Millbank Prison was a prison in Millbank, Pimlico, London, originally constructed as the National Penitentiary, and which for part of its history served as a holding facility for convicted prisoners before they were transported to Australia...

, opened in 1816. It had separate cells for 860 prisoners and proved satisfactory to the authorities who started building prisons to deal with the rapid increase in numbers occasioned by the ending of capital punishment for many crimes and a steady reduction in transportation

Penal transportation

Transportation or penal transportation is the deporting of convicted criminals to a penal colony. Examples include transportation by France to Devil's Island and by the UK to its colonies in the Americas, from the 1610s through the American Revolution in the 1770s, and then to Australia between...

.

Two Acts of Parliament allowed for the building of Pentonville prison, designed by Captain Joshua Jebb

Joshua Jebb

Sir Joshua Jebb was a Royal Engineer and the British Surveyor-General of convict prisons.He participated in the Battle of Plattsburgh on Lake Champlain during the War of 1812, and surveyed a route between Ottawa River and Kingston where Lake Ontario flows into Saint Lawrence River...

, Royal Engineers

Royal Engineers

The Corps of Royal Engineers, usually just called the Royal Engineers , and commonly known as the Sappers, is one of the corps of the British Army....

, for the detention of convicts sentenced to imprisonment or awaiting transportation.