Prior to British colonization, Persian was also widely used as a second language in the Indian subcontinent; it took prominence as the language of culture and education in several Muslim courts in the subcontinent throughout the Middle Ages and became the official court language under the Mughal emperors.
Over this period, the morphology of the language was simplified from the complex conjugation and declension system of Old Persian to the almost completely regularized morphology and rigid syntax of Modern Persian, in a manner often described as paralleling the development of English.
The Academy of PersianLanguage and Literature (as detailed here) as well as many lexicographers have announced that “Farsi” is not the appropriate term to use for the Persianlanguage in English.