Mbh 1.173.4a

“The Gandharva said, ‘O son of Pritha, O foremost of all intelligent men, I will duly recite to you in full this charming narrative. O, listen with attention to what I say in explanation of why I have addressed thee as Tapatya. That one in heaven who pervadeth by his light the whole firmament had a daughter named Tapati equal unto himself. Tapati, the daughter of the god Vivaswat, was the younger sister of Savitri, and she was celebrated throughout the three worlds and devoted to ascetic penances. There was no woman amongst the celestials, the Asuras, the Yakshas, the Rakshasas, the Apsaras, and the Gandharvas, who was equal to her in beauty. Of perfect, symmetrical and faultless features, of black and large eyes, and in beautiful attire, the girl was chaste and of perfect conduct. And, O Bharata, seeing her Savitri (the sun) thought that there was none in the three worlds who, for his beauty, accomplishments, behaviour, and learning, deserved to be her husband. Beholding her attain the age of puberty and, therefore, worthy of being bestowed on a husband, her father knew no peace of mind, always thinking of the person he should select. At that time, O son of Kunti, Riksha’s son, that bull amongst the Kurus, the mighty king Samvarana, was duly worshipping Surya with offerings of Arghya and flower-garlands and scents, and with vows and fasts and ascetic penances of various kinds. Indeed, Samvarana was worshipping Surya constantly in all his glory, with devotion and humility and piety. And beholding Samvarana conversant with all rules of virtue and unequalled on earth for beauty, Surya regarded him as the fit husband for his daughter, Tapati. And, O thou of Kuru’s race, Vivaswat then resolved to bestow his daughter on that best of kings, viz., Samvarana, the scion of a race of world-wide fame. As Surya himself in the heavens filleth the firmament with his splendour, so did king Samvarana on earth fill every region with the splendour of his good achievements.