Mahabharata 3.170.11

हिरण्यपुरमित्येतत्ख्यायते नगरं महत्रक्षितं कालकेयैश्च पौलोमैश्च महासुरैः

hiraṇyapuramityetatkhyāyate nagaraṃ mahatrakṣitaṃ kālakeyaiśca paulomaiśca mahāsuraiḥ

Our plain-language meaning of this verse is waiting for scholar review.