For Zoroastrianism (also known as Parsism after those who fled from Iran to India) the oldest surviving copy of the most sacred prayer, the Ashem vohu, in the now dead language Sogdian from the ninth century; a copy of the law book Videvdad completed in 1323 and one of the four earliest known manuscripts in Avestan (the language of the founder Zoroaster); and many other Avestan scriptures dating from the 15th to the 19th centuries, together with other texts in Pahlavi (the languages of Sassanian Iran), Gujarati, and Persian.
The Library also has the only known copy of the first Parsee work printed in India, the Khordeh Avesta (Bombay, 1798).
The various national churches comprising Eastern Orthodox Christianity are also well covered, including Russian, Bulgarian (with the beautifully illustrated Gospels of Tsar Ivan Alexander from the 14th century), Armenian, Georgian, Coptic, Syrian, Nubian, and from the Ethiopian Church, beside Gospels and Psalm Books, favourite texts such as the Miracles of Mary.
The Ethiopian scriptures also hold significance for the Rastafarian community.
He is known as Zartosht and Zardosht in Persian and Zaratosht in Gujarati.
The Zoroastrian name of the religion is Mazdayasna, which combines Mazda- with the Avestan language word yasna, meaning "worship, devotion".
The British Library is also a wonderful source of information for less well-known religions and spiritual belief systems - some that have died out, some that are less formalised, or more localised, than the major world religions, and some that have fewer adherents today or which have completely died out.