Baladeva

He is the divine son of Vasudeva by his wife Rohiṇī. He is also known as Rohiṇī-nandana, 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 were constant companions from Their 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 their 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 Saṅkarṣaṇa, who is also the plenary portion of Śrī Baladeva. Because He is 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 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. The strength is eternal, and thus Baladeva is the original spiritual master of all devotees. SB 1.11.16-17

Śrī Baladeva was also a class friend of Lord Śrī Kṛṣṇa as a student of Sāndīpani Muni. In His childhood He killed many asuras along with Śrī Kṛṣṇa, and specifically He killed the Dhenukāsura at Tālavana. During the Kurukṣetra battle, He remained neutral, and He tried His best not to bring about the fight. He was in favor of Duryodhana, but still He remained neutral. When there was a club-fight between Duryodhana and Bhīmasena, He was present on the spot. He was angry at Bhīmasena when the latter struck Duryodhana on the thigh or below the belt, and He wanted to retaliate the unfair action. Lord Śrī Kṛṣṇa saved Bhīma from His wrath. But He left the place at once, being disgusted at Bhīmasena, and after His departure Duryodhana fell to the ground to meet his death. The funeral ceremony of Abhimanyu, the son of Arjuna, was performed by Him, as He was the maternal uncle. It was impossible to be performed by any one of the Pāṇḍavas, who were all overwhelmed with grief. At the last stage, He departed from this world by producing a great white snake from His mouth, and thus He was carried by Śeṣanāga in the shape of a serpent. SB 1.11.16-17