Diodotus II - Wikipedia

Diodotus II (Greek: Διόδοτος Β΄; c. 252 BC – c. 223 BC) was a Greco-Bactrian king from c. 239 BC, son of Diodotus I. He is known for concluding a peace treaty with the Parthian king Arsaces, in order to forestall the Seleucid reconquest of both Parthia and Bactria:

"Soon after, relieved by the death of Diodotus I, 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, but he prevailed: the Parthians celebrated this day as the one that marked the beginning of their freedom" (Justin, XLI,4 ^[1])

Around 230 or 223 BC, Diodotus was killed by an usurper, his brother-in-law Euthydemus I, founder of the Greco-Bactrian Euthydemid dynasty (Polybius, 11.34, 2).

Notes

^ Justin XLI

Preceded by:
Diodotus I

Greco-Bactrian Ruler

Succeeded by:
Antiochus Nikator or Euthydemus I

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Hellenistic rulers were preceded by Hellenistic satraps in most of their territories.