Brahma is the Hindu God of creation and one of the Trimurti, the others being Vishnu and Shiva. According to the Brahma Purana, he is the father of Manu, and we are the descendants of Manu.

The creator of the universe, Brahma is depicted as having four heads, though originally he had five. You can find the reference of the fact in the Brahma Purana and all about how he lost one of his five heads while creating the universe. The acquiring of Brahma’s heads makes for an interesting legend.
According to ‘Brahma Purana’, when Brahma was creating the universe, he made a female deity known as Shatarupa. Brahma was immediately infatuated. Shatarupa moved in various directions to avoid the gaze of Brahma. But, wherever she went, Brahma developed a head. Thus, Brahma developed five heads, one on each side and one above the others.
In order to control Brahma, Shiva cut off his top head. Also, Shiva felt that Shatarupa was Brahma’s daughter, being created by him. Therefore, Shiva determined, it was wrong for Brahma to become obsessed with her.
After cutting his one head, Shiva directed that there would be no temple for proper worship of Brahma in India. Thus, only Vishnu and Shiva are worshipped today, while Brahma is almost totally ignored.
There are different explanations for why Brahma only has four heads now, as opposed to his original five. According to the ‘Puranas’, Brahma and Vishnu were once arguing over who was superior of the two. They discovered from the Vedas that Shiva was the supreme being.
Brahma however, spoke disparagingly about Shiva. In anger, Shiva cut off the head, which had spoken, and therefore Brahma was left with four heads.
According to another legend, Shiva is usually shown carrying a human skull in his hand to confront the world with its mortality. Sometimes he uses the skullcap as a drinking bowl. He wears a garland of skulls. The skull is said to be the fifth head of Brahma, cut off by Shiva.