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Cleanthes (331-232 BCE)
http://www.utm.edu/research/iep/c/cleanthe.htm
A brief biography from the Internet Encyclopedia of Philosophy.
Cleanthes of Assos
http://theosophy.org/tlodocs/teachers/CleanthesOfAssos.htm
An essay on the life and teachings of the philosopher from the Great Teacher Series of the Theosophy Library.