What is the origin of stoic?

Zeno of Citium, born in Cyprus in the 4th century B.C.E., traveled to Athens while a young man and studied with the important philosophers of the day, among them two influential Cynics. He eventually arrived at his own philosophy and began teaching at a public hall called the Stoa Poikile. Zeno's philosophy, Stoicism, took its name from the hall where he taught, and it preached self-control, fortitude, and justice; passion was seen as the cause of all evil. By the 14th century, English speakers had adopted the word stoic as a general term for anyone who could face adversity calmly and without excess emotion. By the 15th century, we'd also begun using it as an adjective meaning "not affected by or showing passion or feeling."