The city of Birmingham was more involved in the slave trade than widely believed according to compelling evidence recently uncovered.
Unearthed documents show details of the business links between the city's manufacturing sector and slave traders, along with a pro-slavery petition signed by industrial workers.
The findings, which will be unveiled tonight on BBC One's Inside Out programme for the West Midlands, challenge the assumption that it was primarily ports like Bristol, Liverpool and London which played a significant role in slavery.
It appears Birmingham's industrial sector also made huge profits from the slave trade.
Professor David Dabydeen of Warwick University says: "Birmingham was the main supplier of iron and ironware to Africa... padlocks, irons, chains and muzzles - all the instruments to police the slave trade. Of course that made an enormous amount of money."
From the 1760s onwards, there was also a large trade in weapons, with 150,000 guns made in Birmingham and believed to have been sold to West African rulers.
Guns were exchanged for enslaved Africans and it was a common saying that the price of a slave was one Birmingham gun.
"Birmingham armed the slave trade," adds Professor Dabydeen.
This year, on 25 March, marks the 200th anniversary of the day Parliament voted to abolish the slave trade throughout the British Empire and events are being planned throughout the year to mark the occasion
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