The Yadava were an ancient Indian people who believed to be descended from Yadu, a legendary king of Chandravamsha lineage.
Images of Samkarshana and Vāsudeva, the two most celebrated Vrishni heroes, on a coin of the Indo-Greek king Agathocles (c. 190–180 BCE)
The Vrishnis were an ancient Vedic Indian clan who were believed to be the descendants of Vrishni. It is believed that Vrishni was the son of Satvata, a descendant of Yadu, the son of Yayati. He had two wives, Gandhari and Madri, not to be confused with Gandhari and Madri from the Mahabharata. He has a son named Devamidhusha by his wife Madri. Vasudeva, the father of Krishna was the grandson of Devamidhusha. According to the Puranas, the Vrishnis were residents of Dvaraka.
"Vrishni heroes" on the coinage of Agathocles of Bactria, circa 190-180 BCE: Samkarshana-Balarama, with Gada mace and plow, and Vāsudeva-Krishna, with Shankha (a pear-shaped case or conch) and Chakra wheel. This is "the earliest unambiguous image" of the two deities. Another variation [1].
Vrishni triad shown in a rock painting at Tikla, Madhya Pradesh, 3rd-2nd century BCE. These would be Saṃkarṣaṇa (with plough and mace), Vāsudeva (with mace and wheel) and a female deity, probably Ekanamsha.