Far back in time as it was when this took place, Italy seems to have already possessed numerous cities, many of which were to become enemies of Rome in later days. The most civilized of the Italian peoples were the Etruscans, a nation dwelling north of the Tiber, and whose many cities displayed a higher degree of civilization than those around them. From these the Romans in later days borrowed many of their religious customs, and to them Romulus sent to learn what were the proper ceremonies to use in founding a city. The ceremonies he used were the following. At the centre of the chosen area he dug a circular pit through the soil to the hard clay beneath, and cast into this, with solemn observances, some of the first fruits of the season. Each of his men also threw in a handful of earth brought from his native land. Then the pit was filled up, an altar erected upon it, and a fire kindled on the altar. In this way was the city consecrated to the gods. Then, having harnessed a cow and a bull of snow-white color to a plough whose share was made of brass, Romulus ploughed a furrow along the line of the future walls. He took care that the earth of the furrow should fall inward towards the city, and also to lift the plough and carry it over the places where gates were to be made. As he ploughed he uttered a prayer to Jupiter, Mars, Vesta, and other deities, invoking their favor, and praying that the new city should long endure and become an all-ruling power upon the earth. The Romans tell us that his prayer was answered by Jupiter, who sent thunder from one side of the heavens and lightning from the other. These omens encouraged the people, who went cheerfully to the work of building the walls. But the consecration of the city was not yet completed. Its walls were to be cemented by noble blood. There is reason to believe that in those days the line of a city's walls was held as sacred, and that it was desecration to enter the enclosure at any place except those left for the gates. This may be the reason that Romulus gave orders to a man named Celer, who had charge of the building of the walls, not to let any one pass over the furrow made by the plough. However this be, the story goes that Remus, who was still angry about his brother's victory, leaped scornfully over the furrow, exclaiming, "Shall such defences as these keep your city?"