He had his capital at Sakala in the Punjab (present-day Sialkot, Punjab, Pakistan).
The expression "Indo-Greek Kingdom" loosely describes a number of various dynastic polities, traditionally associated with a number of regional capitals like Taxila, Other potential centers are only hinted at; for instance, Ptolemy's Geographia and the nomenclature of later kings suggest that a certain Theophila in the south of the Indo-Greek sphere of influence may also have been a satrapal or royal seat at one time.
Euthydemus's control extended to Sogdiana, going beyond the city of Alexandria Eschate founded by Alexander the Great in Ferghana: "And they also held Sogdiana, situated above Bactriana towards the east between the Oxus River, which forms the boundary between the Bactrians and the Sogdians, and the Iaxartes River.
Around 322 BC, the Greeks (described as Yona or Yavana in Indian sources) may then have participated, together with other groups, in the armed uprising of Chandragupta Maurya against the Nanda Dynasty, and gone as far as Pataliputra for the capture of the city from the Nandas.
A marriage treaty was arranged for Demetrius with a daughter of Antiochus III the Great, who had partial Persian descent.
During the two centuries of their rule, the Indo-Greek kings combined the Greek and Indian languages and symbols, as seen on their coins, and blended Hindu, Buddhist and ancient Greek religious practices, as seen in the archaeological remains of their cities and in the indications of their support of Buddhism, pointing to a rich fusion of Indian and Hellenistic influences.
The preserved ancient sources (see below) are somewhat contradictory and the exact date of Bactrian independence has not been settled. The new kingdom, highly urbanized and considered as one of the richest of the Orient (opulentissimum illud mille urbium Bactrianum imperium "The extremely prosperous Bactrian empire of the thousand cities" Justin, XLI,1 The Greeks who caused Bactria to revolt grew so powerful on account of the fertility of the country that they became masters, not only of Ariana, but also of India, as Apollodorus of Artemita says: and more tribes were subdued by them than by Alexander...
Somewhat simplified, there is a high chronology (c. Their cities were Bactra (also called Zariaspa, through which flows a river bearing the same name and emptying into the Oxus), and Darapsa, and several others.
was a Hellenistic kingdom covering various parts of the northwest regions of South Asia (mainly modern Afghanistan and Pakistan) during the last two centuries BC and was ruled by more than thirty kings, often in conflict with each other.