The Arabic and modern-Persian influence in the historical Punjab region began with the late first millennium Muslim conquests on the Indian subcontinent. Many Persian and Arabic words were incorporated in Punjabi. So Punjabi relies heavily on Persian and Arabic words which are used with a liberal approach to language. Most important words in Punjabi, like and , and common words, like , etc., have all come out of Persian. After the fall of the Sikh empire, Urdu was made the official language of Punjab (in Pakistani Punjab, it is still the primary official language), and influenced the language as well.