The story of Tur is based on older Indo-European traditions invloving a primordial king who divides his realm between his three sons. Furthermore, the story of
Fereydun dividing the world among his sons has been interpreted as a memory of the kinship between Turanians and Iranians.
Tur is not mentioned in the extant
Avesta, but his story was probably described in the
Chihrdad nask. This book was one of the volumes of the
Sasanian Avesta, but is no
longer extant. However, according to a summary in the later
Denkard, it contained the division of the world between him and his bothers. Next to the Denkard, the stories involving
Tur have also been mentioned in other
Middle Persian works like the
Jamasp Namag. ==In the Shahnameh==