I want to know the answer to the following question:
When did Andragoras proclaim his independence?
All the background I'm provided with is that "In 247 BC, following the death of Antiochus II Theos, Andragoras, the Seleucid governor of Parthia, proclaimed his independence and began minting coins showing himself wearing a royal diadem and claiming kingship.". Is that enough to answer the question?