Then , in 1791 , Parliament prohibited insurance companies from reimbursing ship owners in cases in which slaves were thrown overboard .
The next year Parliament passed the first law regulating the slave trade , to limit the number of slaves per ship .
In 1791 , Parliament prohibited insurance companies from reimbursing ship owners in cases in which slaves were thrown overboard .
The next year Parliament passed the first law regulating the slave trade , to limit the number of slaves per ship .