Port wine left ("pass the port to port") and for the bottle or decanter not to touch the table on its way around, though some cultures reject this tradition. If a diner fails to pass the port, others at the table may ask "Do you know the Bishop of Norwich?" The Port and Douro Wines Institute is an official body belonging to the Ministry of Agriculture of Portugal and is a key institution in promoting the industry and knowledge of making port wine. It was previously known as the Instituto do Vinho do Porto. Producers of port wine are often called "shippers".
Madeira wine up large (112 gal/423 l) casks of wine known as "pipes" for their voyages to India. The intense heat in the holds of the ships had a transforming effect on the wine, as discovered by Madeira producers when one shipment was returned to the island after a long trip. The customer was found to prefer the taste of this style of wine, and Madeira labeled as "vinho da roda" (wines that have made a round trip) became very popular. Madeira producers found that aging the wine on long sea voyages was very costly, so began to develop methods on the