Summerhill House was a 100 roomed mansion which was the ancestral seat of the Viscounts Langford and the Barons Langford. Built in 1731, Summerhill House demonstrated the power and wealth the Langford Rowley family had at the time. They owned vast amounts of land in counties Meath, Westmeath, Cork, Londonderry, Antrim, and Dublin as well as in Devon and Cornwall. The mansion at Summerhill welcomed royalty, it was an exceptionally dignified house and at its time of erection ranked architecturally amongst the finest and grandest mansions in Europe.