There is no consensus on the dating of Zoroaster; the Avesta gives no direct information about it, while historical sources are conflicting. Some scholars base their date reconstruction on the Proto-Indo-Iranian language and Proto-Indo-Persian religion, and thus his origin is considered to have been somewhere in northeastern Homeland and sometime between 1500 and 500 BC.Some scholars such as Mary Boyce (who dated Zoroaster to somewhere between 1700 and 1000 BC) used linguistic and socio-cultural evidence to place Zoroaster between 1500 and 1000 BC (or 1200 and 900 BC).