indo iranians are iranians of Indian descent there are well oer 50,000 of them, I'm in fact a 4th generation Indian or indo Iranian, they are descended from Indians who migrated from India when Muslims and hindus where fighting in 1947, which later led to Pakistan, India, and Bangladesh states

The Indo Iranians were settled in Iranian plateau and north of Hindu Kush Mountains since 2800 BC. They start the culture of horse and chariots. The indo Iranians were the successors of the Proto Indo European people they played an important part in history of India.

No.

Both were of Indo-European ethnic origin, but the Spartans were Dorian Greeks

and the Persians were Iranians.

The chariot was first used as a weapon by the Indo-Iranians from 1700 to 500 BCE. The chariot was built in eastern Europe.

They most likely did not possess written language for most of their existence. They may have used the devanagari script in later years.