Among the Ikșwākus, the first born becomes the sovereign. The first born existing, an inferior son cannot be installed in the kingdom.
इक्ष्वाकूणां हि सर्वेषां राजा भवति पूर्वजः। पूर्वजे नावरः पुत्रो ज्येष्ठो राजाऽभिषिच्यते॥