Satyavrata was the rishi who was advised by Lord Vishnu to build a boat and collect samples of all living beings at the time of great deluge. He was saved by Vishnu in his matsyavatara.
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Sanskrit
IAST
In General
Veda
Purana
Trishanku or Satyavrata
His original name was Satyavrata, but he committed three (tri) sins, and hence got the name...