Aftermaths
Demetrius I died of unknown reasons, and the date 180 BC, is merely a suggestion aimed to allow suitable regnal periods for subsequent kings, of which there were several. Even if some of them were co-regents, civil wars and temporary divisions of the empire are most likely.
The kings Pantaleon, Antimachus, Agathocles and possibly Euthydemus II ruled after Demetrius I, and theories about their origin include all of them being relatives of Demetrius I, or only Antimachus. Eventually, the kingdom of Bactria fell to the able newcomer Eucratides.
Demetrius II was a later king, possibly a son or nephew of his namesake, and he ruled in India only. Justin mentions him being defeated by the Bactrian king Eucratides, an event which took place at the end of the latter's reign, possibly around 150 BC. Demetrius II left behind his generals Apollodotus and Menander I, who in turn became kings of India and rulers of the Indo-Greek Kingdom following his death.
According to Ptolemy, a Demetriapolis was founded in Arachosia.
Demetrius is a legend as well as an enigma. He was mentioned by Geoffrey Chaucer ("D, lord of Ind").
Read more about this topic: Demetrius I Of Bactria