After the Battle of Kuruksetra, Maharaja Yudhisthira was again able to rule his legitimate kingdom, and he reinstated the principles of honor and respect for religion. That is the beauty of a kingdom ruled by a pious king like Maharaja Yudhisthira
SB Canto 3
Also let me inquire whether Mahārāja Yudhiṣṭhira is now maintaining the kingdom according to religious principles and with respect for the path of religion. Formerly Duryodhana was burning with envy because Yudhiṣṭhira was being protected by the arms of Kṛṣṇa and Arjuna as if they were his own arms.
Mahārāja Yudhiṣṭhira was the emblem of religion. When he was ruling his kingdom with the help of Lord Kṛṣṇa and Arjuna, the opulence of his kingdom surpassed all imaginations of the opulence of the kingdom of heaven. His actual arms were Lord Kṛṣṇa and Arjuna, and thus he surpassed everyone's opulence. Duryodhana, being envious of this opulence, planned so many schemes to put Yudhiṣṭhira into difficulty, and at last the Battle of Kurukṣetra was brought about. After the Battle of Kurukṣetra, Mahārāja Yudhiṣṭhira was again able to rule his legitimate kingdom, and he reinstated the principles of honor and respect for religion. That is the beauty of a kingdom ruled by a pious king like Mahārāja Yudhiṣṭhira.