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Sylvia Olive Pleadwell Sayer, Lady Sayer (1904–2000) was one of the foremost early conservators of what is now Dartmoor National Park, in Devon in the south-west of England. She acquired her title in 1959 when her husband, Vice-Admiral Guy Sayer was knighted as the Flag Officer Commanding Reserve Fleet.
She was a fearless[clarification needed] and impassioned[clarification needed]fighter in the defence of Dartmoor: frequently she deliberately interrupted army live-firing exercises on Dartmoor's military ranges, and in 1985 snubbed The Prince of Wales over the Duchy of Cornwall's management plan for Dartmoor, since this allowed for a continuance of military usage.