Maharshi Patanjali is not the 1st Yogi, who know the VEDIC YOGA...

Estimated 15,000 years ago (~13,000 BCE), Adiyogi (the first yogi), a person with unknown origins appeared in the upper regions of Himalayas. Seeing his intense ecstatic state, seven hardcore seekers stayed with him. He took his seven disciples - Sapta Rishis to Kantisarovar and transformed himself in to Aadi Guru - the first guru and started a systematic exposition of yoga in a scientific manner not intellectually as a philosophy, but experientially. After imparting his knowledge he sent his seven disciples to different parts of the world. One went to Central Asia. Another went to North Africa and the Middle East, another went to South America, One stayed right there with Adiyogi. Another one came to the lower regions of the Himalayas and started what is known as Kashmiri Shaivism. Another one went south into the Indian Peninsula who is known as Agastya. The Sapta Rishis became the basis of the seven basic schools of yoga. Even today, these seven schools are still distinctly there. Adiyogi created this spine of knowledge, not in the form of books or teachings, but as an energy-based knowledge.He had the highest understanding of human nature, but he didn’t put anything down in writing. Patanjali came much later to reorganize the complex and diversified subject and he has put them all in a certain format - as the Yoga Sutras.