Matsya Purana — Ila–Sudyumna Episode and the Expansion of the Ikṣvāku
त्रिधन्वनः सुतो जातस् त्रय्यारुण इति स्मृतः तस्मात्सत्यव्रतो नाम तस्मात्सत्यरथः स्मृतः //
tridhanvanaḥ suto jātas trayyāruṇa iti smṛtaḥ tasmātsatyavrato nāma tasmātsatyarathaḥ smṛtaḥ //
From Tridhanvan was born a son remembered by the name Trayyāruṇa. From him came one named Satyavrata, and from Satyavrata is said to have been born Satyaratha.
This verse does not address Pralaya; it is a lineage statement, preserving memory of succession among early kings.
Indirectly, it frames dharma through dynastic continuity: the names “Satyavrata” and “Satyaratha” emphasize truth (satya) as a royal virtue central to righteous rule.
No Vāstu, temple-building, or ritual procedure is stated in this verse; its function is genealogical documentation within the Purāṇic record.