Although generally referred to as the Abbey it is strictly speaking, a Priory as it was a house of Augustinian Canons who are priests rather than monks. It was unusual at the time for every monk to enter the priesthood. Built in the early 12th. Century most of the ruins you see today were built within fifty years. After being given land at Gloucester a second priory Llanthony Secunda was founded there. Thereafter only a few Canons remained at Llanthony and at the time of the dissolution of the monasteries around 1536 only four or five Canons remained. There is no admission charge to explore the ruins and you will find information boards describing the Abbey's history and its eventual demise.
I have made this a multi-cache as the Priory and St. David's Church are both well worth a visit. As dogs are not permitted in the Priory grounds you will need to collect your information from the church which is always open during the daytime but there is a morning service every Sunday.
St. David's Church was at one time the infirmary for the Priory and you will see there is a fireplace at one end, not a feature you would normally find in a church. The adjacent cottage was until the 1950's the village school.
To find the coordinates you will need to look around the outside of the church:-
1) How many hinges are there on the church door = D
2) Go to other side of church and enter graveyard through gates. How many windows with ONLY diamond shaped panes = C
3) Find the grave of Philip Price. The date of his death = 18B0
4) Find two black granite gravestones. Year Matthew Lather Knight was born = 190A
The final coordinates are N 51º 56. (A-D)A(C+D) W 003º 02. D(B-D)(A-C)