Vasugupta is a significant figure in the history of Indian philosophy and spirituality. He lived in the first half of the 9th century in Kashmir and is known as the author of the Shiva Sutras, a foundational text in the Advaita tradition of Kashmir Shaivism, also called Trika Yoga.

Not much is known about Vasugupta's personal life, but it is believed that he gained knowledge and recognition through direct realization. As a Shaiva, he authored the Shiva Sutras, which lays out the essential principles of Kashmir Shaivism. The text consists of 77 sutras or aphorisms, which are divided into three sections - Shambhava, Shakta, and Anava - representing the three stages of spiritual realization.

The origin of the Shiva Sutras is shrouded in mystery, with different stories circulating in later hagiographic texts. According to one legend, Vasugupta found the sutras inscribed on a rock called Sankaropala, while another story suggests that Shiva appeared in his dream and recited the sutras to him, which he then wrote down. However, early texts written by Vasugupta's students do not mention these legends except the one where Vasugupta discovers the Sutras in his dream.

In addition to the Shiva Sutras, Vasugupta also wrote the Spanda Karikas as a commentary on the Shiva Sutras. The Spanda Karikas elaborates on the concepts and ideas presented in the Shiva Sutras and provides further insights into the philosophy of Kashmir Shaivism. The text discusses the nature of consciousness, the relationship between Shiva and Shakti, and the process of spiritual awakening.

Vasugupta played a crucial role in laying the foundation for a cultural and religious renaissance in Kashmir, which continued for centuries until the advent of Islam. His most notable disciple, Bhatta Kallata, further spread the teachings of the Shiva Sutras and wrote the Spanda-karika in the second half of the 9th century. The legacy of Vasugupta and his works continue to be studied and revered by scholars and practitioners today.

Overall, Vasugupta's contributions to Kashmir Shaivism have had a profound impact on Indian philosophy and spirituality. His insights into the nature of consciousness and spiritual realization continue to inspire and guide seekers of truth and knowledge. The Shiva Sutras and the Spanda Karikas remain significant texts in the Advaita tradition of Kashmir Shaivism, and their influence can be seen in the works of many later scholars and philosophers.