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Following the death of Trajan, a series of revolts broke out which Hadrian managed to suppress quickly and effectively. Hadrian avoided war when possible and this was needed after the turmoil of Trajan. His foreign policy was one that sought peace through strength and this was largely effective. Perhaps the best example of Hadrian’s efforts to secure peace through strength was the wall that he ordered built in what is now northern England. Hadrian’s Wall marked the northern boundary of the Roman Empire in Britain. It was also a statement of the power of his realm and as such it was very effective and secured Britannia.<ref>Dobson, Brian Hadrian's Wall (London: Penguin, 2000), p. 102</ref> Hadrian also built or re-built other defensive lines, known as limes all over his Empire.<ref> Birley, p 119</ref> Many has criticized Hadrian for his defensive approach, but it was one that had earlier been recommended by Augustus and was a sound one based on the resources available. <youtube>https://www.youtube.com/watch?v=aKmN7t10t48</youtube>