Seal of <a href="https://en.wikipedia.org/wiki/K%C4%99stutis" class="extiw" title="w:Kęstutis">Kęstutis</a> with the Latin language inscription <i>S[igilum] KYNSTVTTE DVX + DE + TRACKEN</i>, then the <a href="https://en.wikipedia.org/wiki/Duchy_of_Trakai" class="extiw" title="w:Duchy of Trakai">Duke of Trakai</a> and <a href="https://en.wikipedia.org/wiki/Duchy_of_Samogitia" class="extiw" title="w:Duchy of Samogitia">Duke of Samogitia</a>.
<a href="https://en.wikipedia.org/wiki/K%C4%99stutis" class="extiw" title="w:Kęstutis">Kęstutis</a>
1379
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