At only 822 feet high Arthur’s Seat in Edinburgh can hardly be classed as a mountain. But with a city temperature of -3ºC, a fresh covering of snow and poor visibility an ascent ought not to be taken too lightly. It has a prominence sufficient for it to be classed as a Marilyn. So that’s another one ticked off. The rock is igneous, formed as a volcano 350 million years ago, so long extinct, and is hard and slippery. The name is a clue that it has been suggested to be the site of King Arthur’s Camelot but then so have many hills in Britain. There is evidence though that there were Iron Age hill forts on the several summits and cultivation terraces lower down.