Shiva Purana
शिखंडिनी चाजनयत्पुत्रं प्राचीनबर्हिषम् ॥ प्राचीनाग्राः कुशास्तस्य पृथिवीतलचारिणः॥ २५॥
Śikhaṇḍinī gave birth to a son Prācīnabarhis. While he roamed on the earth Kuśa grasses had their tips towards the East.
english translation
zikhaMDinI cAjanayatputraM prAcInabarhiSam ॥ prAcInAgrAH kuzAstasya pRthivItalacAriNaH॥ 25॥
hk transliteration by Sanscript