Sapor's Second Siege of Nisibis.
Its Failure.
Great Battle of Singara.
Sapor's Son made Prisoner and murdered in cold blood.
Third Siege of Nisibis. Sapor called away by an Invasion of the Massagatae._ [Illustration: CHAPTER-8] "Constantius adversus Persas et Saporem, qui Mesopotamiam vastaverant, novem prasliis parum prospere decertavit."-- Orosius, Hist.vii.