Final answer:
The Sage Patanjali is credited as the author of the ancient and foundational text, the Yoga Sutras, dating back to around 400 BCE.
Step-by-step explanation:
The author of the Yoga Sutras is the sage Patanjali, who is believed to have lived around 400 BCE. The Yoga Sutras are a compilation of 196 aphorisms that lay out the philosophy and practice of yoga. Patanjali's work is pivotal in the classical yoga traditions and serves as a foundational text for the understanding of yoga philosophy, outlining a path for achieving the ultimate goal of yoga - the cessation of thoughts and union with the divine.