Sir Ranulph Twisleton-Wykeham-Fiennes, (born 1944) is a British adventurer and holder of several endurance records. Fiennes served in the British army for eight years. He undertook numerous expeditions and was the first person to visit both the North and South Poles by surface means, and the first to cross Antarctica entirely on foot. According to the Guinness Book of World Records, he is the world's greatest living explorer.
Sir Ranulph Fiennes was patron of this expedition.