 By 289 , Maximian was prepared to invade Carausius ' Britain , but for some reason the plan failed . Maximian 's panegyrist of 289 was optimistic about the campaign 's prospects , but the panegyrist of 291 made no mention of it . Constantius ' panegyrist suggested that his fleet was lost to a storm , but this might simply have been to diminish the embarrassment of defeat . Diocletian curtailed his Eastern province tour soon after , perhaps on learning of Maximian 's failure . Diocletian returned in haste to the West , reaching Emesa by May 10 , 290 , and Sirmium on the Danube by July 1 , 290 . 
