It is a religion that has lasted three millennia, claims to be the world's first monotheistic creed and to have influenced major faiths such as Christianity, Judaism and Islam, inspired artists from Voltaire to Freddie Mercury but Zoroastrianism may be heading for extinction: in some communities only children of male Zoroastrians are admitted to the faith and there are probably fewer than 200 thousand left now.

Rajan Datar talks about the history of Zoroastrianism with Dr. Sarah Stewart, Shapoorji Pallonji Lecturer in Zoroastrianism at SOAS, University of London,

Photo: Faravahar - relief of winged sun symbol of Zoroastrianism in Persepolis city, Iran. (Getty Images)