"It was elevated to a language of empire, conferring power and prestige on those who had a command of it. It was spoken by the king, the royal household and the elite at court. Further, it became the language of administration at all levels so that accountants, clerks and other functionaries also learnt it."
Which language is being referred to here in the context of Mughals?

Persian

It was Akbar who consciously set out to make Persian the leading language of the Mughal court. Cultural and intellectual contacts with Iran, as well as a regular stream of Iranian and Central Asian migrants seeking positions at the Mughal court, might have motivated the emperor to adopt the language. Persian was elevated to a language of empire, conferring power and prestige on those who had a command of it. It was spoken by the king, the royal household and the elite at court. Further, it became the language of administration at all levels so that accountants, clerks and other functionaries also learnt it