Sources : Reindeer
Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.95): Rangiver is an animal of the genus of the stag or the doe, living in Norway. But it is very strong in body and strength, excellent in flight. It has the name rangiver as meaning 'carrying branches'. For it wears three rows of horns on its head in the manner of bushes. It has two horns larger than the others in the place where that of the deer is, but larger and longer, being five cubits, increasing the number of branches to sometimes twenty-five. But it has two other horns right in the middle of the head, and these ones almost like the horns of the doe, broad at the same time and surrounded by many branches, but short. But it also has two other horns against its forehead, but not like horns, but rather like the bones that are usually in the shoulder blades. With these ranks of horns the beasts are armed against their adversaries and also increase the merit of admiration in monstrous beasts. - [Badke translation/paraphrase]