I have spent quite a while in the past searching for this place, both using satellite images, walking around the area and research on the internet - the main problem is that the area that it is in private land which is working game land, the other being that there are in fact three 'known' graves within a very short distance. This grave is the one where he was buried, there is another one in a very stately homes residence and the other is in a grave yard in a church near to this site.
My sincere thanks to Nick for his assistance in getting to this place (he visited it about 15 years ago)
The story goes that Robin was wounded and went to get refuge and medical assistance from the nunnery (which still exists, but is on private property and is a no go area - a big shame), the nuns poisoned him (how or why is unclear) and on his deathbed, he fired a arrow and stated where ever it landed he was to be buried.
The epitaph that reads: "Hear undernead dis laitl stean laiz robert earl of Huntingtun near arcir ber az hei sa geud an pipl kauld im robin heud sick utlawz az hi an iz men vil england nibr si agen obiit 24 kal dekembris 1247" which when translated into modern English reads:
"Robert Earl of Huntingdon lies under this little stone. No archer was like him so good; his wildness named him ROBIN HOOD. For thirteen years, and something more, these northern parts he vexed sore. Such outlaws as he and his men, may England never know again. 8th November 1247"
Some people say you get a eerie feeling about this place, like you shouldn't be there. Nick and myself had that feeling, but this was the reason -
A very early way point that was used to travel across England, this is very close to the nunnery and the grave.