In the midst of the civil wars, which became more serious after the death of Eucratides, Mithridates of Parthia began to extend his dominions at the expense of Bactria: even in the life-time of Eucratides he succeeded in annexing two satrapies. Another account makes Mithridates rule as far as India, and declares him to have obtained without war the old kingdom of Porus, or the rule over all nations between the Indus and the Hydaspes. The two accounts are reconciled by Chinese records, which tell that, about 161 B.C., the nomad people Sse broke into the valley of the Cophen and founded a kingdom in the very place of the Parthian conquests in India, which must therefore have been ephemeral. This fact has its importance, as illustrating the way in which the internal wars of the east Iranian Greeks helped to prepare the ground for the Scythian invasion. After this success in the east Mithridates turned his attention to the west, where the chances of success were not less inviting. Demetrius had at length fallen before a coalition of the neighbouring sovereigns, powerfully supported by the Romans through their instrument, the exile Heraclides. A pretender, Alexander, in 145 B.C., was utterly defeated by Ptolemy, and slain in his flight by an Arab chieftain. Demetrius (II) Nicator, however, soon made himself bitterly hated, and five years of fighting drove him out of the greater part of Syria. MEDIA AND BABYLONIA CONQUERED Such was the state of the empire when war broke out between Media and Parthia, which was finally decided in favour of the latter. The short-lived independence of Media was soon cut short by Mithridates, who did not lose the opportunity afforded by the civil wars of Syria in 147 B.C. Babylonia followed the fate of Media; and the whole province, with its capital Seleucia, fell into the hands of the Parthians. Thus the East was finally lost to the Macedonians.