The Penitentiary Act was a British

Kingdom of Great Britain

The former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...

 Act of Parliament

Act of Parliament

An Act of Parliament is a statute enacted as primary legislation by a national or sub-national parliament. In the Republic of Ireland the term Act of the Oireachtas is used, and in the United States the term Act of Congress is used.In Commonwealth countries, the term is used both in a narrow...

 passed in 1779 which introduced state prisons for the first time. The Act was drafted by the prison reformer John Howard

John Howard (prison reformer)

John Howard was a philanthropist and the first English prison reformer.-Birth and early life:Howard was born in Lower Clapton, London. His father, also John, was a wealthy upholsterer at Smithfield Market in the city...

 and the jurist William Blackstone

William Blackstone

Sir William Blackstone KC SL was an English jurist, judge and Tory politician of the eighteenth century. He is most noted for writing the Commentaries on the Laws of England. Born into a middle class family in London, Blackstone was educated at Charterhouse School before matriculating at Pembroke...

 and recommended imprisonment as an alternative sentence to death

Capital punishment

Capital punishment, the death penalty, or execution is the sentence of death upon a person by the state as a punishment for an offence. Crimes that can result in a death penalty are known as capital crimes or capital offences. The term capital originates from the Latin capitalis, literally...

 or 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...

.

The prison population in England and Wales

England and Wales

England and Wales is a jurisdiction within the United Kingdom. It consists of England and Wales, two of the four countries of the United Kingdom...

 had risen following the United States Declaration of Independence

United States Declaration of Independence

The Declaration of Independence was a statement adopted by the Continental Congress on July 4, 1776, which announced that the thirteen American colonies then at war with Great Britain regarded themselves as independent states, and no longer a part of the British Empire. John Adams put forth a...

 as the American Colonies

Thirteen Colonies

The Thirteen Colonies were English and later British colonies established on the Atlantic coast of North America between 1607 and 1733. They declared their independence in the American Revolution and formed the United States of America...

 had been used as the destination for transported criminals. Also, Howard had produced a report to a House of Commons

British House of Commons

The House of Commons is the lower house of the Parliament of the United Kingdom, which also comprises the Sovereign and the House of Lords . Both Commons and Lords meet in the Palace of Westminster. The Commons is a democratically elected body, consisting of 650 members , who are known as Members...

 select committee in 1777 which had identified appalling conditions in most of the prisons he had inspected.

The purpose of the Act had therefore been to create a network of state-operated prisons but, after passage through Parliament

Parliament of Great Britain

The Parliament of Great Britain was formed in 1707 following the ratification of the Acts of Union by both the Parliament of England and Parliament of Scotland...

, the end result was that only two prisons in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

were created.