Ramayana
पूरुश्चकार तद्राज्यं धर्मेण महता वृतः । प्रतिष्ठाने पुरवरे काशिराज्ये महायशाः ॥ 7-59-19 ॥
And Puru, encompassed by great dharma, the greatly renowned one, ruled that kingdom in the excellent city of Pratishthana, in the realm of Kashi.
english translation