Roman emperor <a href="https://en.wikipedia.org/wiki/Nerva" id="mwEw" rel="mw:WikiLink" title="Nerva">Nerva</a> is forced by the <a href="https://en.wikipedia.org/wiki/Praetorian_Guard" id="mwFA" rel="mw:WikiLink" title="Praetorian Guard">Praetorian Guard</a> to adopt general <a href="https://en.wikipedia.org/wiki/Trajan" id="mwFQ" rel="mw:WikiLink" title="Trajan">Marcus Ulpius Trajanus</a> as his heir and successor.