In the left corner is the _lapis niger_, the traditional tomb of Romulus. Facing us is the Arch of Titus, and to the right is the Palatine.] The city on the Palatine had been extended so as to include the town of the Sabines or Quirites on the neighbouring Quirinal hill, before the first king, who was born in the Sabine country, was called to rule the Romans. The Capitol at this time was a spur of the Quirinal, and so remained until Trajan dug away a part of the latter to lay the foundations of his forum. The Etruscans lived on the Caelian and the two horns of the Esquiline hills; the former was incorporated in the primitive city, but the Esquiline and Viminal were not enclosed until the time of Servius Tullius when Rome first became "the city on Seven Hills." The Aventine where Remus had wished to build the city was colonised by the conquered Latin towns in the reign of Ancus Martius, and this isolated hill, overlooking the Tiber on one side and the campagna on the other, still haunts the imagination with its melancholy beauty, its pariah history, as though it embodied the undying protest of Remus, an unceasing claim upon Roman justice. The varied and interesting Christian memories here, which begin with the _titulus_ of Priscilla and Aquila, are continued in the Priory of the once international Order of the Knights of Malta, recording the noblest effort of the lay world during the middle ages--the institution of chivalry; and in the modern Benedictine house of Saint Anselm--our English Anselm. The Janiculum, the site of a fortress built by Ancus Martius against the Etruscans, was not enclosed within the city walls till the time of Aurelian; the Vatican hill was only enclosed in the ninth century by Leo IV. All these hills were once steep defences against enemies in the surrounding country; now that there are no longer any enemies the Romans appear bent on abolishing the hills, and the mania for planing and razing is carried to an extent which must seem nothing less than childish to the visitor. The Viminal has become almost indistinguishable since the Villa Massimo was pulled down, and only the name _Via Viminale_, which replaces the older Via Strozzi, indicates the hill which lay between the Quirinal and the Esquiline. Some idea may be gained of the original steepness of the hills when we realise that in the memory of the Romans the road past Palazzo Aldobrandini--on a slope of the Quirinal--used to be at the level of the top of the high wall which now surrounds it. The Capitol was only approachable from the Forum, and was never connected with the city on the hither side until the construction of the historic steps of Ara Coeli, one of the rare works undertaken by the Romans during the absence of the popes in Avignon.