Mbh 3.172.1a

“Arjuna continued, ‘Then while returning, I happened to descry a mighty unearthly city, moving at will, and having the effulgence of fire or the sun. And that city contained various trees composed of gems, and sweet-voiced feathered ones. And furnished with four gates, and gate-ways, and towers, that impregnable (city) was inhabited by the Paulamas and Kalakanjas. And it was made of all sorts of jewels and was unearthly, and of wonderful appearance. And it was covered with trees of all kinds of gems, bearing fruits and flowers. And it contained exceedingly beautiful unearthly birds. And it always swarmed throughout with cheerful Asuras, wearing garlands, and bearing in their hands darts, two edged swords, maces, bows, and clubs. And, O king, on seeing this wonderful city of the Daityas, I asked Matali saying, ‘What is this that looketh so wonderful?’ Thereat, Matali replied, ‘Once on a time a Daitya’s daughter, named Pulama and a mighty female of the Asura order, Kalaka by name, practised severe austerities for a thousand celestial years. And at the end of their austerities, the self-create conferred on them boons. And, O king of kings, they received these boons,--that their offspring might never suffer misfortune; that they might be incapable of being destroyed even by the gods, the Rakshasas and the Pannagas; and that they might obtain a highly effulgent and surpassingly fair aerial city, furnished with all manner of gems and invincible even by the celestials, the Maharshis, the Yakshas, the Gandharvas, the Pannagas, the Asuras and the Rakshasas. O best of the Bharatas, this is that unearthly aerial city devoid of the celestials, which is moving about, having been created for the Kalakeyas, by Brahma himself. And this city is furnished with all desirable objects, and is unknown of grief or disease. And, O hero, celebrated under the name of Hiranyapura, this mighty city is inhabited by the Paulamas and the Kalakanjas; and it is also guarded by those mighty Asuras.