Jacques de Vitry [ca. 1220 CE] (Historia Hierosolymitana, Chapter 88): There is a particularly ferocious beast called the lanzani, and no animal is safe from its ferocity, for it is said that it frightens even the lion. - [Machine-assisted translation based on Donnadieu.]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.57): The lanzani is an animal from whose cruelty no animal can be safe. For, as they say, it deters the lion itself, which is otherwise feared by all. It preys upon beasts not of its own kind; but it spares its kind. Those animals are infested with an implacable hatred that preys on the rest of the animals. And when it persecutes this crime in others, it does not properly remember the iniquity. It persecutes man in a strange way, and this perhaps by divine judgment, so that it who ought to be the most placid of all animals in nature, is the most selfish of all, with the malice of vicious iniquity. - [Badke translation/paraphrase]