Answer:Under the emperor Trajan, the Roman European boundaries were set at. Britain in the northwest and Mesopotamia in the east. Britain in the east and Mesopotamia in the northeast. Ireland in the northwest and Mesopotamia in the west.
They mostly grew wheat, barley, oats, rye, and corn. because of this, they were basically known as the "Breadbasket". So I believe your answer would most likely be wheat.
