The Amorim family’s fortune had its beginnings among the rambling port lodges that line the hillsides above the Douro River in Porto, but the family did not amass its wealth by making Portugal’s famous fortified wine; rather, its members were engaged in the less glamorous business of manufacturing cork stoppers. Their success, however, later enabled them to diversify their interests into banking, telecommunications, and—with the purchase of Quinta Nova de Nossa Senhora do Carmo—viticulture. At this 18th-centur…