The first thing that hits your mind when you think of “Pythagoras” is (obviously!) The Pythagoras Theorem. I was surprised to know that his contribution in the field of Philosophy and Metempsychosis is equally significant.. if not more!
The transmigration of souls, or metempsychosis, is a concept which underpins Plato’s ideas concerning innate knowledge. Plato may have incorporated this concept from two Greek religious groups that preceded him: the Pythagoreans or the Orphics.
Transmigration of the soul (sometimes given simply as Transmigration) is a philosophy of reincarnation incorporating the specific belief that after death, the soul of a living being is then transferred (or transmigrates) into another living form and thus takes birth again. The philosophy of transmigration is often connected with a belief that the karma (or, the actions) of the soul in one life (or, more generally, a series of past lives) determines the future existence. It is a belief found within Hindu traditions (such as Yoga, Vaishnavism, and Jainism) and Greek philosophy.