Mahabharata 1.59.41

भीमसेनोग्रसेनौ च सुपर्णो वरुणस्तथागोपतिर्धृतराष्ट्रश्च सूर्यवर्चाश्च सप्तमः

bhīmasenograsenau ca suparṇo varuṇastathāgopatirdhṛtarāṣṭraśca sūryavarcāśca saptamaḥ

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