“King Ashwapati of Madra, a virtuous and protective ruler, had no children. Following the advice of Sage Parashar, he performed a Gayatri ritual in the forest. By the grace of Goddess Gayatri, he was blessed with a daughter named Savitri.”
Comprehensive Savitri Vrat guide: The stories of Savitri-Satyavan and Naga-Nagin, including full ritual procedure (Vidhi) and materials (Samagri).