Chandragupta's grandson Ashoka, who had converted to the Buddhist faith declared in the Edicts of Ashoka, set in stone, some of them written in Greek, Here in the king's domain among the Greeks, the Kambojas, the Nabhakas, the Nabhapamkits, the Bhojas, the Pitinikas, the Andhras and the Palidas, everywhere people are following Beloved-of-the-Gods' instructions in Dharma.Some Greeks (Yavanas) may have played an administrative role in the territories ruled by Ashoka: the Junagadh rock inscription of Rudradaman records that during the rule of Ashoka, a Yavana King/ Governor named Tushaspha was in charge in the area of Girnar, Gujarat, mentioning his role in the construction of a water reservoir.
Alexander had also established several colonies in neighbouring Bactria, such as Alexandria on the Oxus (modern Ai-Khanoum) and Alexandria of the Caucasus (medieval Kapisa, modern Bagram).
After Alexander's death in 323 BC, Bactria came under the control of Seleucus I Nicator, who founded the Seleucid Empire.
but since the extensive sources available on Seleucus never mention an Indian princess, it is thought that the marital alliance went the other way, with Chandragupta himself or his son Bindusara marrying a Seleucid princess, in accordance with contemporary Greek practices to form dynastic alliances. From him, Vindusara was born and ruled for the same number of years as his father.
An Indian Puranic source, the Pratisarga Parva of the Bhavishya Purana, described the marriage of Chandragupta with a Greek ("Yavana") princess, daughter of Seleucus, "Chandragupta married with a daughter of Suluva, the Yavana king of Pausasa. His son was Ashoka." On these occasions, Greek populations apparently remained in the northwest of the Indian subcontinent under Mauryan rule.
For example, Artemidoros (80 BC) may have been of Indo-Scythian ascendency.
The kingdom was founded when the Graeco-Bactrian king Demetrius invaded the subcontinent early in the 2nd century BC.
Diodotus was succeeded by his son Diodotus II, who allied himself with the Parthian Arsaces in his fight against Seleucus II: Soon after, relieved by the death of Diodotus, Arsaces made peace and concluded an alliance with his son, also by the name of Diodotus; some time later he fought against Seleucos who came to punish the rebels, and he prevailed: the Parthians celebrated this day as the one that marked the beginning of their freedom and possibly satrap of Sogdiana, overthrew Diodotus II around 230 BC and started his own dynasty.
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.
The Greeks in the Indian Subcontinent were eventually divided from the Graeco-Bactrians centered in Bactria (now the border between Afghanistan and Uzbekistan), and the Indo-Greeks in the present-day north-western Indian Subcontinent.
The most famous Indo-Greek ruler was Menander (Milinda).
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.