Matsya Purana — Solar Dynasty Prelude: Vivasvān–Saṃjñā–Chāyā
अथ दिग्जयसिद्ध्यर्थम् इलः प्रायान्महीम् इमाम् भ्रमन्द्वीपानि सर्वाणि क्ष्माभृतः सम्प्रधर्षयन् //
atha digjayasiddhyartham ilaḥ prāyānmahīm imām bhramandvīpāni sarvāṇi kṣmābhṛtaḥ sampradharṣayan //
Then, to accomplish success in the conquest of the quarters, Ila set forth across this earth, roaming through all the continents and challenging the kings who bore the burden of the land.
This verse does not describe Pralaya; it focuses on a historical-royal episode where Ila undertakes a digvijaya (conquest of the quarters) across the dvīpas.
It reflects the kshatriya ideal of establishing sovereignty and order: a king proves capability through digvijaya—testing rival rulers (kṣmābhṛt) and consolidating rule—an aspect often tied to Rajadharma in Purāṇic literature.
No explicit Vāstu, temple-building, or ritual procedure is stated; the key technical term is digjaya (directional conquest), a royal-political motif rather than an architectural one.