Freydoun Qajar was born at the Golestan Palace, Tehran, on 22 January 1922.

The point, however, was not pressed by Fereydoun Mirza's trustees, for personal and familial reasons.

Mohammad Hassan Mirza retained the title of crown prince and declared himself Shah in exile in 1930.

Freydoun was the Head of the Imperial House of Qajar after the death of his father on 27 February 1930.

Freydoun died at Geneva, having had three children, one son, Teymour, and two daughters, Cheyda and Eylah (not in the line of succession).