in previous centuries. Greco-Bactrian Kingdom Considerable difficulties faced by the Seleucid kings and the attacks of Pharaoh Ptolemy II Philadelphus gave the satrap of Bactria, Diodotus I, the opportunity to declare independence about 245 BC and conquer Sogdia. He was the founder of the Greco-Bactrian Kingdom. Diodotus and his successors were able to maintain themselves against the attacks of the Seleucids—particularly from Antiochus III the Great, who was ultimately defeated by the Romans (190 BC). The Greco-Bactrians were so powerful that they were able to expand their territory as far as South Asia: The Greco-Bactrians used the Greek language for administrative purposes, and the local Bactrian language was also Hellenized, as suggested by its adoption of the Greek alphabet and Greek loanwords. In turn, some of these words were also borrowed by modern Pashto. Indo-Greek Kingdom The Bactrian king Euthydemus I and his son Demetrius I crossed the Hindu Kush mountains and began the conquest of the Indus valley. For a short time, they wielded great power: a great Greek empire seemed to have arisen far in the East. But this empire was torn by internal dissension and continual usurpations. When Demetrius advanced far east of the Indus River, one of his generals, Eucratides, made himself king of Bactria, and soon in every province there arose new usurpers, who proclaimed themselves kings and fought against each other. Most of them we know only by their coins, a great many of which are found in Afghanistan. By these wars, the dominant position of the Greeks was undermined even more quickly than would otherwise have been the case. After Demetrius and Eucratides, the kings abandoned the Attic standard of coinage and introduced a native standard, no doubt to gain support from outside the Greek minority. In the Indus valley, this went even further. The Indo-Greek king Menander I (known as Milinda in South Asia), recognized as a great conqueror, converted to Buddhism. His successors managed to cling to power until the last known Indo-Greek ruler, a king named Strato II, who ruled in the Punjab region until around 55 BC. Other sources, however, place the end of Strato II's reign as late as 10 AD. Daxia, Tukhara and Tokharistan Daxia, Ta-Hsia, or Ta-Hia () was the name given in antiquity by the Han Chinese to Tukhara or Tokhara: the central part of Bactria. The name "Daxia" appears in Chinese from the 3rd