There was an estate here since at least the 12th century. It was owned by two knightly families and then became crown property for a while after the reformation. I have put together quite a detailed history of the estate by researching national and county archives.
From the 17th century another family lived here for 4 generations. They were on the wrong side of the English Civil War. They were a Catholic family and maintained a priest here. They also fought on the losing side of the first Jacobite Rebellion and then the '45. One of the brothers was hanged at York for his efforts.
The coins I find mostly span the years from around 1180 to the 19th century. I suppose if one person drops one coin once a decade over 500 years that adds up to a lot of coins to be found.
Of course most of them are under a foot of earth. The only accessible finds are those that have been turned over by the plough.