The Mughals are from a long Turco-Persian tradition, though, which matters more than our modern concept of their 'race'. Persian was interrupted as a lingua franca in the Persian region by Arabic, but a new form of Persian, assisted by co-opting Arabic vocabulary and script, became popular because it was used in centres of culture and power, which were focused around rulers. This spread as the various Turco-Persian empires spread, with Persian often having centre stage as the courtly language, but also becoming endorsed as an 'official' language, and even when it was not, it became more popular for songs, poetry, and literature, and was often the first choice as a lingua franca at the borders of the empire.