De administrando imperio, a manual of how to rule addressed by Constantine to his son Romanus to teach him how to be a wise ruler, provides a wide range of historical and political info…
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“ Kōnstantinou en Christōi basilei aiōniōi basileōs Rōmaiōn pros ton idion huion Rōmanon ton Theostephē kai porphyrogennēton basilea”, in:
Christian-Muslim Relations 600 - 1500, General Editor David Thomas.
Consulted online on 24 October 2019 <http://dx.doi.org/10.1163/1877-8054_cmri_COM_23832>