Large villas were important to the Roman economy. They dominated the Po valley, Campania, and Sicily, and were also found in Gaul. Villas were centres of mining, pottery, or horse raising. Villas specializing in shipping olive oil to Roman legions in Germany were a feature of the southern Iberian province of Hispania Baetica. Some luxurious villas have been excavated in North Africa in Africa Province and Numidia, or Fishbourne Palace in Britannia.