Indian philosophy are the systems of thought and reflection that were developed by the civilizations of the Indian subcontinent. They include both orthodox (astika) systems, namely, the Nyaya, Vaisheshika, Samkhya, Yoga, Mimamsa (or Purva-Mimamsa), and Vedanta (Advaita, Dwaita, Bhedbheda, Vishistadvaita), and unorthodox (nastika) systems, such as Buddhism, Jainism, Ajivika, Ajnana, and Charvaka. as well as other schools such as Raseswera, Paninya, Pratyabhijna, Pasupata Shaivism, Shaivism etc. Indian thought has been concerned with various philosophical problems, significant among which are the nature of the world (cosmology), the nature of reality (metaphysics), logic, the nature of knowledge (epistemology), ethics, and the philosophy of religion. Some of the most famous and influential philosophers of all time were from the Indian subcontinent such as the Buddha, Nagarjuna, and Adi Shankara. This list is until the 14th century CE.