The significance of the boar in prehistory

I believe the importance of the Boar in celtic mythology actually harkens back to the earlier prehistoric eras, where the people feasted on large quantities of pigs, as at Durrington Walls near Stonehenge. 

These seem to have not been merely slaughtered for food but to have been downed in some kind of ritualised hunt, where they were chased and shot by arrows, many of which had barbs fashioned for maximum blood-letting. There would have been lots of pigs squealing and screaming; it has been suggested that these sounds may have been thought to resemble human screams...and interestingly, at Durrington Walls a human femur that had been pierced by a similar arrow was also found amidst the pig-bones.

I note within interest in the article that Welsh hero Pryderi faced a boar within an 'enclosure.' Could this be a memory of something that happened within a henge?    http://www.celticidentity.com/the-boar/

Boar's tusk. Two were found by my partner during the 2012-2013 dig giving the earliest carbon date of around 7000BC. Quite a large critter too. 

Another interesting legend that may well have its roots in the earlier prehistoric era, when wealthy cattle lords roamed the plains and the heads of pole-axed oxen were inserted into henge terminals and burial mounds...
Near Petersfield in Hampshire there is a Fair called the Tarot Fair, which takes place on a heath covered in bronze age burial mounds. From the middle ages and onwards this hair was a Horse Fair...but the name is a corruption of the Welsh Tarw--Bull, which seems to indicate this was an event of some antiquity.

tarb feis
TAR-uv FESH
Irish: "bull feast" i.e. feast=meal, but feis may also come from foaid, meaning "sleep"

A magical practice, mentioned in medieval texts1 to determin the successor to the king. This is the description in "The Destruction of Da Derga's Hostel":

A bull-feast is gathered by the men of Erin, in order to determine their future king; that is, a bull used to be killed by them and thereof one man would eat his fill and drink its broth, and a spell of truth was chanted over him in his bed. Whosoever he would see in his sleep would be king, and the sleeper would perish if he uttered a falsehood.

THE SWORD OF TULKAR and other stories from Prehistoric Britain & Ireland **DOWNLOAD ON KINDLE FOR FREE** 17/18th February ONLY here