The Battle of Petroe, also known as the Battle of Hades, was fought on 20 August 1057 between two rival Byzantine armies: the loyalist forces of the Byzantine emperor Michael VI Stratiotikos under the proedros Theodore, and the supporters of the rebel general Isaac Komnenos.
A gold histamenon showing Michael VI in imperial regalia, being crowned by the Theotokos
Gold histamenon struck by Isaac I Komnenos. His martial posture, bearing a naked sword, is unique among Byzantine imperial coinage.
Isaac I Komnenos or Comnenus was Byzantine emperor from 1057 to 1059, the first reigning member of the Komnenian dynasty.
Gold tetarteron of Michael VI.
Gold histamenon struck by Isaac. His martial posture, bearing a naked sword, is unique among Byzantine coinage.
Patriarch Michael Keroularios on his throne, from the Madrid Skylitzes