It also talks about the conquests of the 'horse peoples', first under the Assyrians, then the Achaemenids, Parthians and Sassanids; then in the 7th century the Arabs conquer a lot of territory, followed by the Mongols under Genghis Khan and finally the last of the horse peoples under a Mongol named Tamerlane, who unleashes massive carnage and destruction.
The area was a constant area of contention between Rome (and later the Byzantines) and the Sassanids, who fought over Mesopotamia.
Khosrau not only returned Dara and Martyropolis in exchange for Maurice's assistance, but also agreed to a new partition of the Caucasus by which the Sassanids handed over to the Byzantines many cities, including Tigranokert, Manzikert, Baguana, Valarsakert, Bagaran, Vardkesavan, Yerevan, Ani, Kars, and Zarisat.
The Sassanids marked a major victory in 256, when they defeated the XV Apollinaris and conquered its fortress, Satala, sacking Trapezus in 258.
Following the fall of the Sassanids, after which Zoroastrianism came to be gradually supplanted by Islam, Pazend lost its purpose and soon ceased to be used for original composition.
Parthia ultimately fell not to the Romans, but to the Sassanids under Ardashir I, who entered Ctesiphon in 226.