 In the subsequent Treaty of Apamea in 188 BC, the Seleucids were compelled to pay costly war reparations and relinquished claims to territories west of the Taurus Mountains.The Parthians under Mithridates I of Parthia conquered much of the remaining eastern part of the Seleucid Empire in the mid-2nd century BC, while the independent Greco-Bactrian Kingdom continued to flourish in the northeast.However, the Seleucid kings continued to rule a rump state from Syria until the invasion by Armenian king Tigranes the Great in 83 BC and their ultimate overthrow by the Roman general Pompey in 63 BC.