Ac. to Norsk portrettarkiv the rapier in upper left part is painted by Christian Olsen.
<bdi><a href="https://en.wikipedia.org/wiki/en:Mathias_Stoltenberg" class="extiw" title="w:en:Mathias Stoltenberg"><span title="Norwegian painter (1799-1871)">Mathias Stoltenberg</span></a>
</bdi>
Eidsvoll 1814: image no. <a rel="nofollow" class="external text" href="http://www.digitaltmuseum.no/things/011023119249/EM/EM.01310">EM.01310</a>, via digitaltmuseum.no.