The family in which Kṛṣṇa appeared is called the Yadu dynasty. This Yadu dynasty belongs to the family descending from Soma, the god in the moon planet. There are two different kṣatriya families of the royal order, one descending from the king of the moon planet and the other descending from the king of the sun planet. When the Supreme Personality of Godhead appears, He generally appears in a kṣatriya family because He has to establish religious principles, or the life of righteousness. The kṣatriya family is the protector of the human race, according to the Vedic system. When the Supreme Personality of Godhead appeared as Lord Rāmacandra, He appeared in the family descending from the sun-god, known as the Raghu-vaṁśa; and when He appeared as Lord Kṛṣṇa, He did so in the family known as the Yadu-vaṁśa. There is a long list of the kings of the Yadu-vaṁśa in the Ninth Canto, Twenty-fourth Chapter, of Śrīmad-Bhāgavatam. All of them were great, powerful kings. Kṛṣṇa's father's name was Vasudeva, son of Śūrasena, descending from the Yadu dynasty. Actually, the Supreme Personality of Godhead does not belong to any dynasty of this material world, but the family in which the Supreme Personality of Godhead appears becomes famous, by His grace. For example, sandalwood is produced in the states of Malaya. Sandalwood has its own qualifications apart from Malaya, but because accidentally this wood is mainly produced in the states of Malaya, it is known as Malayan sandalwood. Similarly, Kṛṣṇa, the Supreme Personality of Godhead, belongs to everyone, but just as the sun rises from the east, although there are other directions from which it could rise, so by His own choice the Lord appears in a particular family, and that family becomes famous.
As explained above, when Kṛṣṇa appears, all His plenary expansions appear with Him. Kṛṣṇa appeared along with Balarāma (Baladeva), who is known as His elder brother. Balarāma is the origin of Saṅkarṣaṇa, of the quadruple expansion. Balarāma is also the plenary expansion of Kṛṣṇa. In this book, the attempt will be made to show how Kṛṣṇa appeared in the family of the Yadu dynasty and how He displayed His transcendental characteristics. This is very vividly described in Śrīmad-Bhāgavatam—specifically, the Tenth Canto—and thus the basis of this book will be the Tenth Canto of Śrīmad-Bhāgavatam.