Analysis of information sources in references of the Wikipedia article "Vương quốc Ấn-Hy Lạp" in Vietnamese language version.
Since parts of their territories comprised northwestern India, these later rulers of Greek origin are generally referred to as Indo-Greeks.
The invasion of India by a Greco-Bactrian army in ... led to the creation of an Indo-Greek kingdom in northwestern India (present-day India and Pakistan).
Three phases must be distinguished, (a) The Greek rulers of Bactria (the Oxus region) expand their power to the south, conquer Afghanistan and considerable parts of north-western India, and establish an Indo-Greek kingdom in the Panjab where they rule as 'kings of India'; i
There were later Indo-Greek kingdoms in northwest India. ...
They are referred to as 'Indo-Greeks' and there were about forty such kings and rulers who controlled large areas of northwestern India and Afghanistan. Their history ...
The existence of Greek kingdoms in Central Asia and northwestern India after Alexander's conquests had been known for a long time from a few fragmentary texts from Greek and Latin classical sources and from allusions in contemporary Chinese chronicles and later Indian texts.