Okehampton Castle, Devon's largest medieval fortress, towers over a valley near the northern edge of Dartmoor. Begun in 1068 by Baldwin FitzGilbert following the Norman Conquest, it evolved from an earth-and-timber stronghold into a luxurious stone residence during the 14th and 15th centuries under the Courtenay family. The castle features a prominent keep, great hall, and extensive domestic buildings. Its fortunes declined dramatically in the 16th century when Henry Courtenay, the last Earl, was executed for treason by King Henry VIII. By the English Civil War, Okehampton had fallen into ruin, with its stones plundered for local construction, and today the atmospheric remains stand as testament to its once-grand medieval significance.