Ardhanarishvara:

Born from the eye of Brahma, Rudra was born neither male nor female.

Brahma told him to procreate through love, and so Rudra then split him-self to create the Rudras/ Rudraganas/ Pramathaganas through sexual union as male and female.

Brahma saw that Rudra had created beings resembling him-self and then requested him to create mortal beings and not just immortals.

But Rudra refused and so the Grand-sire later on gave birth to the Prajapatis to procreate and populate the world.

The Prajaptis were: Marichi, Angira, Bhrigu, Atri, Pulastya, Pulaha, Pracheta, Narad, Daksha and Kratu.

This story is as per the Shiva Maha Purana. The Vedas on the other hand tell a different version.

🙏 Namo Narasiṁha 🙏.