 In 88 AD, the Emperor Domitian had ordered the Legio XX abandon the fort they had been building in Scotland at Inchtuthil and redeploy to garrison the legionary fortress Deva Victrix (Chester).But the fort is estimated to have been built later than the other forts on Dere Street, around 150 AD.There is evidence it was rebuilt around 230/240 AD and again in the early 4th century.