John O'Neill's son sold Larch Hill in 1845; another tombstone exists in the graveyard which bears the inscription Courtney Kenny Clarke, Larch Hill, Died 1873. Again, this owner was a wealthy businessman, and possibly an owner of one of the many mills which existed along the banks of the Owendoher River in Rockbrook. In those days Rathfarnham was known throughout Europe for its fine paper from the papermills. Many wealthy families constructed large houses in the hills around Rathfarnham. The family of Mr Clarke donated funds to the Whitechurch Church of Ireland Chapel which enabled a vestry to be dedicated in his memory.