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In page Severan dynasty:

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In late 197 Severus fought a successful war against the Parthians[1]: 130 [2]: 6 , between 208 and 210 he campaigned with success against barbarian incursions in Roman Britain[1]: 180  and rebuilt Hadrian's Wall[citation needed]. In Rome, his relations with the Senate were poor, but he was popular with the commoners and with his soldiers, whose salary he raised. Starting in 197, his praetorian prefect, Gaius Fulvius Plautianus, was growing in influence, but he would be executed in 205. Septimius died, from natural causes, in early 211 while on campaign in Britain[1]: 187 [2]: 8 .