The <i><a href="https://en.wikipedia.org/wiki/tourmarches" class="extiw" title="en:tourmarches">tourmarches</a></i> Basil sent as ambassador (<i><a href="https://en.wikipedia.org/wiki/apokrisiarios" class="extiw" title="en:apokrisiarios">apokrisiarios</a></i>) to the Caliph (<i><a href="https://en.wikipedia.org/wiki/Amir_al-Mu%27minin" class="extiw" title="en:Amir al-Mu'minin">Amermoumnes</a></i>) <a href="https://en.wikipedia.org/wiki/Al-Mu%27tasim" class="extiw" title="en:Al-Mu'tasim">Al-Mu'tasim</a> in 838
Unknown, 12th/13th century author
12th/13th century
Chronicle of John Skylitzes, cod. Vitr. 26-2, fol. 60