Answer :

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The reason why the Athenians believed that Theseus was a descendant or heir of Hercules is rooted in Greek mythology and the legends surrounding both of these figures. Here's why:

1. Connection to Hercules: Theseus was a prominent hero in Greek mythology, known for his bravery and heroic deeds, much like Hercules. Both Theseus and Hercules were considered great heroes who performed incredible feats.

2. Heritage: Hercules was a demigod, the son of Zeus, the king of the gods, and a mortal woman. Theseus, on the other hand, was the son of Aegeus, the king of Athens, and also had divine connections through his lineage. This shared heritage could have contributed to the belief that Theseus was somehow connected to Hercules.

3. Similar Exploits: Both Hercules and Theseus were known for their heroic adventures and their battles against monsters and other foes. These shared experiences and the heroic nature of their deeds could have led the Athenians to see Theseus as a successor or heir to Hercules.

In summary, the Athenians believed that Theseus was a hereditary figure of Hercules due to their shared heroic qualities, divine connections, and similar exploits in Greek mythology.