Boars are certainly dangerous, but I'm not sure I would consider them a "significant" danger. There are stories like the Calydonian Boar (a giant boar that terrorized a Greek town and took an all-star team of Greek heroes to hunt) that show that people feared boars. However, people responded to the threat of boars and other wild animals by avoiding their habitats. There is a reason why so many folk tales turn south the minute someone enters a forest (I'm thinking of Little Red Riding Hood and any number of Grimm tales). People legitimately feared forests.

Boars were considered a very noteworthy trophy animal, some would even say they were the pinnacle of hunting. Boars were murderous. The will continue to rush you even after they have been gored and they will run themselves purposefully up a spear once they make up their mind to gore you. Hunters used a special type of spear for hunting boars with a small cross bar under the point in order to stop the boars. There is a boar-tusk helmet from Bronze Age Mycenae. It offers little actual protection but it sent a clear message to anyone seeing it that its wearer had no issue with boars.