Patanjali is the purported author of the [wiki]Yoga sutras[/wiki]. He is said to have lived in either the 2nd millenium bce (by Indian chronology) or the 1st millenium bce (by Western chronology) Patanjali is also considered by some scholars to have been the same Patanjali to which works on Ayurveda and grammar have been attributed, but not all scholars agree that this is the same Patanjali.