Possibly the most recognizable European name we may know of, that was seized by Pirates and made a slave was St. Vincent de Paul. You know, there are those thrift stores called "Society of St. Vincent de Paul", Churches, even DePaul university in Illinois. Read his biography, and one sees, he was on a ship seized and sold into slavery. By some fortune, none of his masters were very mean and he managed to find his freedom. I think one of his masters gave him his freedom but I'm not positive.