It is estimated that up to 1.25 million Europeans were enslaved by the so-called Barbary corsairs, and their lives were just as pitiful as their African counterparts. They have come to be known as the white slaves of Barbary.
... The slaves captured by the Barbary pirates faced a grim future. Many died on the ships during the long voyage back to North Africa due to disease or lack of food and water. Those who survived were taken to slave markets where they would stand for hours while buyers inspected them before they were sold at auction.
After purchase, slaves would be put to work in various ways. Men were usually assigned to hard manual labour, such as working in quarries or heavy construction, while women were used for housework or in sexual servitude. At night the slaves were put into prisons called 'bagnios' that were often hot and overcrowded. However, by far the worst fate for a Barbary slave was being assigned to man the oars of galleys. Rowers were shackled where they sat, and never allowed to leave. Sleeping, eating, defecation and urination took place at the seat. Overseers would crack the whip over the bare backs of any slaves considered not to be working hard enough.(H/t The Woodpile Report)