"Vasudev was yadav" "Krishna was born in yadav family,who also said in geeta that I AM YADAV" In Indian epic poetry, Vasudeva (Devanagari वसुदेव, IAST Vasudeva) is the father of Krishna, the son of Shoorsen, of the Yadu and Vrishni dynasties. He was brother of King Nand Baba  who was foster father of Lord Krishna. His sister Kunti was married to Pandu. Kunti plays a big role later in the war Mahabharata. Vasudeva was a partial incarnation of Rishi Kashyap. The patronymic Vāsudeva (with long ā) is a popular name of Krishna. According to the Harivansa Purana, Vasudeva and Nanda were brothers.
Related to this name is an early religion, sometimes called Bhagavatism that was largely formed by the 4th century BC where Vāsudeva (Krishna, the son of Vasudeva) was worshiped as the supreme Deity in a strongly monotheistic format, where the Supreme Being was perfect, eternal and full of grace.
The name forms part of a famous mantra also known as a "twelve syllable mantra", which believed to be the earliest mantra from pre-reformation times, pre-dating sectarian divisions in Vaishnavism- (IAST oṁ namo bhagavate vāsudevāya), it is translated as "Om, reverence to the Lord Vāsudeva (Krishna)".
Vasudeva and Devaki spent most of their early adult life behind bars in the deepest pits of darkness as ordered by Kansa. Vasudeva was known for his consistent approach to life and his virtue of being a truthful person, never uttering a lie during his lifetime. After Kansa was killed by Krishna, Vasudeva was installed as the Crown-Prince of Mathura under the reign of Devaki's uncle, King Ugrasena.
The name is from vásu "good" and deva "deity". The Vasus are a group of eight Vedic deities.
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