Of all the princes, the eldest is always installed as the king. Even this is the accepted principle of all sovereigns, specially the descendants of Ikşvāku.
सततं राजपुत्रेषु ज्येष्ठो राजाभिषिच्यते। राज्ञामेतत् समं तत् स्यादिक्ष्वाकूणां विशेषतः॥