"Heliocles I (Greek: Ἡλιοκλῆς; reigned 145–120 BCE) was a Greco-Bactrian king, brother and successor of Eucratides the Great, and considered (along with his co-ruler and son/nephew Heliocles II) the last Greek king to reign over the Bactrian country. His reign was a troubled one; according to Roman historian Justin, Eucratides was murdered crossing the Hindu Kush by one of his sons, although this is highly disputed and Justin fails to name the perpetrator. Eucratides’ death led to instability, even civil war, which caused the Indian parts of the empire to be lost to Indo-Greek king Menander I and southern Bactria to be lost to the Yuezhi." - (en.wikipedia.org 19.09.2021)
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