Nasatya and Dasra are said to be the two Ashvins. They are the sons of Martanda born of his wife Samjna, from whose nostrils they emanated.
नासत्यश्चापि दत्तश्च स्मृतौ द्वावश्विनावपि॥ मार्तण्डस्यात्मजावेतौ संज्ञानासाविनिर्गतौ।