Vachaspati Mishra was a ninth or tenth century Indian Hindu philosopher of the Advaita Vedanta tradition. He wrote so broadly on various branches of Indian philosophy that later Indian scholars called him “one for whom all systems are his own”, or in Sanskrit, a sarva-tantra-sva-tantra.
Vācaspati Miśra was a prolific scholar and his writings are extensive, including bhasya (commentaries) on key texts of almost every 9th-century school of Hindu philosophy with notes on non-Hindu or nāstika traditions such as Buddhism and Carvaka.
He also wrote one non-commentary, Tattvabindu, or Drop of Truth, which focuses on Mīmāṃsā theories of sentence meaning. Some of his works are lost to history or yet to be found.
Little is known about Vācaspati Miśra’s life, and the earliest text that has been dated with certainty is from 840 CE, and he was at least one generation younger than Adi Śaṅkara.
However, an alternate date for the same text may be 976 CE, according to some scholars, a confusion that is based on whether Hindu Śaka or Vikrama era calendar is used for the dating purposes.
Historical scholarship locates him as a Maithil Brahmin from Andhra Tharhi Bihar. It is believed that the name of his most famous work “Bhāmatī” was inspired by his devout wife.