Meaning the truth-speaker, husband of Savitri. The oldest known version of the story of Savitri and Satyavan is found in "The Book of the Forest" of the Mahabharata.
The story occurs as multiple embedded narratives in the Mahabharata as told by Markandeya. When Yudhisthira asks Markandeya whether there has ever been a woman whose devotion matched Draupadi’s, Markandeya replies by relating a story.