 इक्ष्वाकूणां हि सर्वेषां राजा भवति पूर्वजः।पूर्वजे नापरः पुत्रो ज्येष्ठो राज्येऽभिषिच्यते।। 
 In the line of the Ikshvakus, only the eldest son becomes king. When the eldest is living, a youger son cannot become the king. The eldest son alone is consecrated in the kingdom. 