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assassinate him. He barely escaped with his life. Elsewhere, however, he gathered support.
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Clarkson's speech at the collegiate church in Manchester (now Manchester Cathedral) on 28 October
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1787 galvanised the anti-slavery campaign in the city. That same year, Clarkson published the
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pamphlet A Summary View of the Slave Trade and of the Probable Consequences of Its Abolition.
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Clarkson was very effective at giving the committee a high public profile: he spent the next two
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years travelling around England, promoting the cause and gathering evidence. He interviewed 20,000
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sailors during his research. He obtained equipment used on slave-ships, such as iron handcuffs,
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leg-shackles, and thumbscrews; instruments for forcing open slaves' jaws; and branding irons. He
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published engravings of the tools in pamphlets and displayed the instruments at public meetings.
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Clarkson's research took him to English ports such as Bristol, where he received information from
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the landlord of the Seven Stars pub. (The building still stands in Thomas Lane.) He also travelled
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repeatedly to Liverpool and London, collecting evidence to support the abolitionist case.
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Clarkson visited The Lively, an African trading ship. Although not a slave ship, it carried cargo
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of high-quality goods: carved ivory and woven textiles, beeswax, and produce such as palm oil and
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peppers. Impressed by the high quality of craftsmanship and skill expressed in these items,
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Clarkson was horrified to think that the people who could create such items were being enslaved. He
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bought samples from the ship and started a collection to which he added over the years. It included
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crops, spices and raw materials, along with refined trade goods.
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Clarkson noticed that pictures and artefacts could influence public opinion more than words alone.
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He began to display items from his collection of fine goods to reinforce his anti-slavery lectures.
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Demonstrating that Africans were highly skilled artisans, he argued for an alternative humane
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trading system based on goods rather than labourers. He carried a "box" featuring his collection,
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which became an important part his public meetings.
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He rode by horseback some 35,000 miles for evidence and visited local anti-slave trade societies
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founded across the country. He enlisted the help of Alexander Falconbridge and James Arnold, two
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ship's surgeons he had met in Liverpool. They had been on many voyages aboard slave ships, and were
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able to recount their experiences in detail for publication.
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Clarkson also continued to write against the slave trade. He filled his works with vivid firsthand
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descriptions from sailors, surgeons and others who had been involved in the slave traffic. In 1788
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Clarkson published large numbers of his Essay on the Impolicy of the African Slave Trade (1788).
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Another example was his "An Essay on the Slave Trade" (1789), the account of a sailor who had
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served aboard a slave ship. These works provided a grounding for William Wilberforce's first
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abolitionist speech in the House of Commons on 12 May 1789, and his 12 propositions.
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Olaudah Equiano (Gustavus Vassa) a member of the Sons of Africa published his memoir, The
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Interesting Narrative of the Life of Olaudah Equiano, one of the genre of what became known as
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slave narratives – accounts by slaves who achieved freedom. As an African with direct experience of
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the slave trade and slavery, Equiano was pleased that his book became highly influential in the
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anti-slavery movement. Clarkson wrote to the Rev Thomas Jones MA (1756-1807) at Trinity College,
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Cambridge, to introduce Equiano to him and the community. He asked for aid from the Rev Jones in
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selling copies of the memoir and arranging for Equiano to visit Cambridge to lecture.
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In 1791 Wilberforce introduced the first Bill to abolish the slave trade; it was easily defeated by
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163 votes to 88. As Wilberforce continued to bring the issue of the slave trade before Parliament,
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Clarkson travelled and wrote anti-slavery works. Based on a plan of a slave ship he acquired in
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Portsmouth, he had an image drawn of slaves loaded on the slave ship Brookes; he published this in
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London in 1791, took the image with him on lectures, and provided it to Wilberforce with other
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anti-slave trade materials for use in parliament.
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This was the beginning of their protracted parliamentary campaign, during which Wilberforce
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introduced a motion in favour of abolition almost every year. Clarkson, Wilberforce and the other
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members of the Committee for the Abolition of the Slave Trade and their supporters, were
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responsible for generating and sustaining a national movement that mobilised public opinion as
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never before. Parliament, however, refused to pass the bill. The outbreak of War with France
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effectively prevented further debate for many years. Henry Dundas, 1st Viscount Melville, who was
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the Secretary of State for War for prime minister William Pitt the Younger, instructed Sir Adam
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Williamson, the lieutenant-governor of Jamaica, to sign an agreement with representatives of the
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French colonists of Saint Domingue, later Haiti, that promised to restore the ancien regime,
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slavery and discrimination against mixed-race colonists, a move that drew criticism from
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abolitionists Wilberforce and Clarkson.
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By 1794, Clarkson's health was failing, as he suffered from exhaustion. He retired from the
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campaign and spent some time in the Lake District, where he bought an estate at Ullswater. There he
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became a friend of the poet William Wordsworth.
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On 19 January 1796 he married Catherine Buck of Bury St Edmunds, Suffolk; their only child Thomas
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was born in 1796. They moved to the south of England for the sake of Catherine's health, and
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settled at Bury St Edmunds from 1806 to 1816. They then lived at Playford Hall, between Ipswich and
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Woodbridge in Suffolk.
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When the war with France appeared to be almost over, in 1804 Clarkson and his allies revived the
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anti-slave trade campaign. After his ten years' retreat, he mounted his horse to travel again all
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over Great Britain and canvass support for the measure. He appeared to have returned with all his
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old enthusiasm and vigour. He was especially active in persuading MPs to back the parliamentary
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campaign.
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Passage of the Slave Trade Act in 1807 ended the trade and provided for British naval support to
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enforce the law. Clarkson directed his efforts toward enforcement and extending the campaign to the
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rest of Europe, as Spain and France continued a trade in their American colonies. The United States
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also prohibited the international trade in 1807, and operated chiefly in the Caribbean to interdict
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illegal slave ships. In 1808 Clarkson published a book about the progress in abolition of the slave
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trade. He travelled to Paris in 1814 and Aix-la-Chapelle in 1818, trying to reach international
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agreement on a timetable for abolition of the trade. He contributed the article on the "Slave
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Trade" for Rees's Cyclopædia, Vol. 33, 1816.
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Later career
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In 1823 the Society for the Mitigation and Gradual Abolition of Slavery (later known as the
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Anti-Slavery Society) was formed. Clarkson travelled the country to build support for its goal. He
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covered 10,000 miles, and activated the network of sympathetic anti-slavery societies which had
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been formed. This resulted in 777 petitions being delivered to parliament demanding the total
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emancipation of slaves. When the society adopted a policy of immediate emancipation, Clarkson and
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Wilberforce appeared together for the last time to lend their support. In 1833 the Slavery
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Abolition Act was passed, with emancipation completed on 1 August 1838 in the British colonies.
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Clarkson lived an additional 13 years. Although his eyesight was failing, he continued to campaign
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for abolition, focusing on the United States, where slavery had expanded in the Deep South and some
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states west of the Mississippi River. He was the principal speaker in 1840 at the opening of the
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first World's Anti-Slavery Convention in Freemasons' Hall, London, chaired by Thomas Binney. The
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conference was designed to build support for abolishing slavery worldwide and included delegates
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from France, the US, Haiti (established in 1804 as the first black republic in the Western
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Hemisphere) and Jamaica.
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The scene at Clarkson's opening address was painted in a commemorative work, now in the National
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Portrait Gallery, London. The emancipated slave, Henry Beckford (a Baptist deacon in Jamaica), is
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shown in the right foreground. Clarkson and the prominent abolitionist Quaker William Allen were to
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the left, the main axis of interest. In 1846 Clarkson was host to Frederick Douglass, an American
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former slave who had escaped to freedom in the North and became a prominent abolitionist, on his
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first visit to England. Douglass spoke at numerous meetings and attracted considerable attention
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and support. At risk even prior to passage in the US of the Fugitive Slave Law of 1850, Douglass
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was grateful when British friends raised the money and negotiated purchase of his freedom from his