The Parthian (Parthian Chronicles Book 1) by Peter Darman
When Rome transgresses upon his father's domain that lays between the Tigris and Euphrates rivers, Pacorus, a prince of the Parthian Empire, is sent to exact revenge. After a string of victories Pacorus and his men are captured in Cappadocia, clapped in chains and sent to Italy to live out the rest of their days as slaves. But fate intervenes and Pacorus and his companions are saved from a living hell by a renegade gladiator named Spartacus. In gratitude, Pacorus agrees to help Spartacus build his army as Rome musters its legions to crush the slave uprising. And so begins an epic adventure of glory and savagery played out across the length and breadth of Italy, as Spartacus defeats the armies of Rome and Pacorus leads his horsemen to victory after victory. But will Pacorous and the slave army escape from Italy, and will he win the love of the fierce and proud Gallia before the most powerful man in Rome, Marcus Licinius Crassus, takes the field against Spartacus?
A map of the Parthian Empire at the time of Pacorus (the 1st Century BC) can be found on the maps page of my website: www.peterdarman.com