Final answer:
Triopas is the individual who fled to Caria after helping murder Tenages, seized a promontory named after him, and founded the city of Knidos.
Step-by-step explanation:
The individual who fled to Caria after helping to murder Tenages, one of the Heliadae, seized a promontory that eventually took his name and founded the city of Knidos is Triopas. Triopas, being one of the Heliadae, found himself in a troubling scenario that led to his flight to Caria, where he notably engaged in the foundational work that would pave the way for future generations in the region.