याज्ञवल्क्य - राजधर्म

यस्मिन् देशे य आचारो व्यवहारः कुलस्थितिः ।
तथैव परिपाल्योऽसौ यदा वशमुपागतः ॥

- याज्ञवल्क्य

When a king conquers another state, he must rule that state as per the laws and customs prevailing in that state. He must uphold the dignity of the families in that state. He must ensure that business runs as usual.

- Yajnavalkya