Yorkshireman Lionel Abson was the longest surviving European stationed in West Africa in the eighteenth century. He reached William's Fort at Ouidah on the Slave Coast as a trader in 1767, took over the English fort in 1770, and remained in charge until his death in 1803. He avoided the 'white man's grave' for thirty-six years. Along the way he had three sons with an African woman, the eldest partly schooled in England, and a bright daughter...