His death is, for reasons easily intelligible, nowhere mentioned in the Avesta; in the Shah-Nama he is said to have been murdered at the altar by the Turanians in the storming of Balkh.
Zoroastrianism was the national religion of Iran, but it was not permanently restricted to the Iranians, being professed by Turanians as well.
They may have been Turanians akin to that tribe, or they may have been Iranians akin to the Iranian element in Transoxiana and the districts south of the Pamirs.
The Iranian tradition, preserved in the Avesta and in Firdousi's Shahnama, localizes a part of its heroes and myths in the east of Iran, and has transformed the old gods who fight with the great snake into kings of Iran who fight with the Turanians.
Many modern authors have attempted to make history out of these stories, and have created an old Bactrian empire of great extent, the kings of which had won great victories over the Turanians.