 St Rufus has been designated a Category A listed building, and is still in use as an active place of worship; the burial ground of the demolished church, which contains carved memorials to people from the 17th, 18th and 19th centuries, is Category B listed.Christianity in Keith can be traced back to around 700 AD, when Máel Ruba, an Irish missionary monk, came to the area.Keith's old town, which ran along the east bank of the River Isla, was served by a medieval church that stood on a hill in the middle of old Keith.