572
Śrīmad-Bhāgavatam
[Canto 1, Ch. 11]
and his son was the powerful Kaṁsa. This Kaṁsa imprisoned his father and became the King of Mathurā. By the grace of Lord Kṛṣṇa and His brother Lord Baladeva, Kaṁsa was killed, and Ugrasena was reinstalled on the throne. When Śālva attacked the city of Dvārakā, Ugrasena fought very valiantly and repulsed the enemy. Ugrasena inquired from Nāradajī about the divinity of Lord Kṛṣṇa. When the Yadu dynasty was to be vanquished, Ugrasena was entrusted with the iron lump produced from the womb of Śāmba. He cut the iron lump into pieces and then pasted it and mixed it up with the sea water on the coast of Dvārakā. After this, he ordered complete prohibition within the city of Dvārakā and the kingdom. He got salvation after his death.
Baladeva:  He is the divine son of Vasudeva by his wife Rohiṇī. He is also known as Rohiṇīnandana, the beloved son of Rohiṇī. He was also entrusted to Nanda Mahārāja along with His mother Rohiṇī when Vasudeva embraced imprisonment by mutual agreement with Kaṁsa. So Nanda Mahārāja is also the foster father of Baladeva along with Lord Kṛṣṇa. Lord Kṛṣṇa and Lord Baladeva both were constant companions from very childhood, although They were stepbrothers. He is the plenary manifestation of the Supreme Personality of Godhead, and therefore He is as good and powerful as Lord Kṛṣṇa. He belongs to the  Viṣṇu-tattva  (the principle of Godhead). He attended the  svayaṁvara  ceremony of Draupadī along with Śrī Kṛṣṇa. When Subhadrā was kidnapped by Arjuna by the organized plan of Śrī Kṛṣṇa, Baladeva was very angry with Arjuna and wanted to kill him at once. Śrī Kṛṣṇa, for the sake of His dear friend, fell at the feet of Lord Baladeva and implored Him not to be so angry. Śrī Baladeva was thus satisfied. Similarly, He was once very angry with the Kauravas, and He wanted to throw the whole city into the depths of the Yamunā. But the Kauravas satisfied him by surrendering unto His divine lotus feet. He was actually the seventh son of Devakī prior to the birth of Lord Kṛṣṇa, but by the will of the Lord He was transferred to the womb of Rohiṇī to escape the wrath of Kaṁsa. His other name is therefore Śaṅkarṣaṇa, who is also the plenary portion of Śrī Baladeva. Because He was as powerful as Lord Kṛṣṇa and can bestow spiritual power to the devotees, He is therefore known as Baladeva. In the  Vedas  also it is enjoined that no one can know the Supreme Lord without being favored by Baladeva.  Bala  means spiritual strength and not physical. Some less intelligent persons interpret  bala  as the strength of the body. But no one can have spiritual realization by physical strength. Physical strength ends with the end of the physical body, but spiritual strength follows the spirit soul to the next transmigration, and therefore the strength obtained by Baladeva is never wasted.