text:  <unk> 's brief reign was marred by financial difficulties and his inability to assert his authority over the Roman army . A revolt by the <unk> Guard in October 97 essentially forced him to adopt an heir . After some <unk> <unk> adopted Trajan , a young and popular general , as his successor . After barely fifteen months in office , <unk> died of natural causes on 27 January 98 . Upon his death he was succeeded and deified by Trajan . 
  