Duddingston Kirk, near the banks of the loch, is one of the oldest Scottish churches still in regular use, founded in the 12th century.
Duddingston Kirk is the oldest church in Scotland. 
mnli hypothesis: Duddingston Kirk is the oldest church in Scotland.  premise: Duddingston Kirk, near the banks of the loch, is one of the oldest Scottish churches still in regular use, founded in the 12th century.