Persecution of Zoroastrians is the religious persecution inflicted upon the followers of the Zoroastrian faith. The persecution of Zoroastrians occurred throughout the religion's history. The discrimination and harassment began in the form of sparse violence and forced conversions. Muslims are recorded to have destroyed fire temples. Zoroastrians living under Muslim rule were required to pay a tax called Jizya.
Zoroastrian places of worship were desecrated, shrines were destroyed and mosques were built in their place. Many libraries were burned and much of their cultural heritage was lost. Gradually an increasing number of laws were passed which regulated Zoroastrian behavior and limited their ability to participate in society. Over time, the persecution of Zoroastrians became more common and widespread, and the number of believers decreased by force significantly.
Most were forced to convert due to the systematic abuse and discrimination inflicted upon them by followers of Islam. Once a Zoroastrian family was forced to convert to Islam, the children were sent to an Islamic school to learn Arabic and study the teachings of Islam, as a result some of these people lost their Zoroastrian faith. However, under the Samanids, who were Zoroastrian converts to Islam, the Persian language flourished. On occasion, the Zoroastrian clergy assisted Muslims in attacks against those who they deemed Zoroastrian heretics.
Until the Arab invasion and subsequent Muslim conquest, in the mid 7th century Persia (modern-day Iran) was a politically independent state, spanning from the Aegean Sea to the Indus River and dominated by a Zoroastrian majority. Zoroastrianism was the official state religion of four pre-Islamic Persian empires, the last being the Sassanian empire that passed a decree solidifying this in 224 CE. The Arab invasion abruptly brought to an end the religious domination of Zoroastrianism in Persia and instituted Islam as the official religion of the state.