tldr - forest was cleared by about 2000-1500BC primarily for grazing although some evidence of cereal being grown. However, by 1000-1BC the climate deteriorated and spread of peat led to abandonment of higher moor.
Climatic improvement in early medieval times led to re-occupation, but by mid-1300's the population had moved again to better land. Black Death reduced Devon's population by 2/3 and meant that if you survived you went and farmed better land.
Farming is still hard on Dartmoor, driven by soil and weather. For example Princetown is 23Km and 400 metres away from Plymouth, but rainfall doubles from about 1000mm to 2000mm per annum.
tldr - forest was cleared by about 2000-1500BC primarily for grazing although some evidence of cereal being grown. However, by 1000-1BC the climate deteriorated and spread of peat led to abandonment of higher moor.
Climatic improvement in early medieval times led to re-occupation, but by mid-1300's the population had moved again to better land. Black Death reduced Devon's population by 2/3 and meant that if you survived you went and farmed better land.
Farming is still hard on Dartmoor, driven by soil and weather. For example Princetown is 23Km and 400 metres away from Plymouth, but rainfall doubles from about 1000mm to 2000mm per annum.