- c640–546? b.c., Greek philosopher, born in Miletus.
- ?624–?546 bc, Greek philosopher, mathematician, and astronomer, born in Miletus. He held that water was the origin of all things and he predicted the solar eclipse of May 28, 585 bc
- Greek philosopher who was considered by later Greek writers to be a founder of geometry and abstract astronomy. He is said to have accurately predicted a solar eclipse in 585 bce, although this and certain other stories associated with Thales have been questioned by modern scholars.
An ancient philosopher of Greece, called by some the first genuine Greek philosopher. He lived about 600 years before Jesus and about 150 years before Socrates.