The source of coffee was as early as in the 16th century. An Ethiopian shepherd, Carloti, once brought a group of goats to a new pasture to feed them. The goats were excited to jump at the meal. Afterwards, the goats could not sleep at night.
Carloti was troubled so he spoke with the nearby monastery chief. The chief learned that the goats had eaten a low-yellow red fruit. So they tested this themselves and drank the resulting juice after cooking it. That evening, they too were unable to turn in at night.
They decide to let the monks try the drink, since they fought in the church during the night. The effect was very good. As long as the monks have night activities, they would now drink this juice to boost their spirits. This is the origin of coffee beans.