Master-General of the Ordnance The Rt. Hon. General Sir George Murray 1772-1846. The man responsible for mapping the remote Douro valley in the first half of the 19th century. "the greatest brain on the Peninsular after to Wellington" Though Baron Joseph James Forrester gains so much credit for mapping the Douro valley and its winemaking quintas, it is undeoubtedly the case the majority of cartographical work was carried out by the British Army under the direction of this man. Click to see the full length portrait, magnificently painted by Sir Henry Raeburn.