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In page Roman legion:

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In the Later Roman Empire, the number of legions was increased and the Roman army expanded. There is no evidence to suggest that legions changed in form before the Tetrarchy, although there is evidence that they were smaller than the paper strengths usually quoted. The final form of the legion originated with the elite legiones palatinae created by Diocletian and the Tetrarchs. These were infantry units of around 1,000 men rather than the 5,000, including cavalry, of the old legions. The earliest legiones palatinae were the Lanciarii, Joviani, Herculiani and Divitenses.[citation needed]