Edinburgh, the capital of Scotland, is traditionally said to have been "built on Seven Hills", in an allusion to the seven hills of Rome. While there is considerable room for debate as to which hills are included and excluded from the seven, seven possibilities are listed in an old rhyme: Abbey, Calton, Castle grand, Southward see St Leonards stand, St Johns and Sciennes as two are given, And Multrees makes Seven. The Pentland Hills are also just to the south of the city, and their lower slopes are within the city boundary, especially around Hillend, Swanston and Balerno. Some of the hills are formed from dead volcanoes that last erupted 400 million years ago, and all show the effect of glaciation. The tale of the seven hills of Edinburgh is popular enough that several local business take their name from it, including a dentist, a tour company, and a cèilidh band. Traditional Seven There is some argument as to which the seven are. Arthur's Seat and the Braid Hills, for example, are ranges of hill, containing several summits, rather than just one. In total, there are ten summits with a prominence of at least . Arthur's Seat (height 251m, prominence 174m) at The highest of the seven, an ancient volcano incorporating Salisbury Crags (174m, 65m), Dunsapie Hill (145m, 34m) and several other smaller hills. Castle Rock — a volcanic plug (128m, 60m) at Calton Hill (103m, 46m) at Corstorphine Hill — a ridge (162m, 117m) at Braid Hills (213m, 51m) at Blackford Hill (164m, 63m) at Craiglockhart Hill at A running race, held yearly since 1980, takes in these seven hills, starting and finishing at Calton Hill (although it actually excludes Wester Craiglockhart because it is private property, and instead includes the lower Easter Craiglockhart). Debate over 'The Seven' Before the construction of the New Town, Edinburgh was built on a single hill, the volcanic Castle Rock and its tail that extended to the east. The building of the New Town and subsequent development in the 19th and 20th centuries saw first Calton Hill and later all of the others listed above being absorbed into the city, and the "traditional seven" have some claim to being described as the seven principal hills within the modern boundaries of Edinburgh. There are many other hills in Edinburgh, some part of the above ranges, or simply hidden beneath housing etc. There are for