What is coffee origin?

It is told that Kaldi, a 9th-century Ethiopian goatherd, was the one who discovered coffee, though this did not appear in writing until 1671 and is probably apocryphal. From Ethiopia, coffee was said to have spread to Yemen, where the coffee beverage was first made and drunk, and then the beverage went to Egypt. The earliest credible evidence of either coffee drinking or knowledge of the coffee tree appears in the middle of the fifteenth century, in the Sufi monasteries around Mokha in Yemen.