Upanishads author works [ note: the principle Upanishads were likely authored much earlier ] title↓ yearauthorsthe ten principal upanishads-3100upanishads authorthe upanishads breath of the eternal-3100upanishads author, swami prabhavanandathe principal upanishads-3100upanishads author, sarvepalli radhakrishnan bio wikipedia ⚲ search title matches the principal upanishads1the ten principal upanishads1the upanishads breath of the eternal1ancient india1human life2