Other Mentu-hoteps and other Antefs continued on the line of Theban kings, reigning quietly and ingloriously, and leaving no mark upon the scroll of time, yet probably advancing the material prosperity of their country, and preparing the way for that rise to greatness which gives Thebes, on the whole, the foremost place in Egyptian history. Useful projects occupied the attention of these monarchs. One of them sank wells in the valley of Hammamât, to provide water for the caravans which plied between Coptos and the Red Sea. Another established military posts in the valley to protect the traffic and the Egyptian quarrymen. Later on, a king called Sankh-ka-ra launched a fleet upon the Red Sea waters, and opened direct communications with the sacred land of Punt, the region of odoriferous gums and of strange animals, as giraffes, panthers, hunting leopards, cynocephalous apes, and long-tailed monkeys. There is some doubt whether "Punt" was Arabia Felix, or the Somauli country. In any case, it lay far down the Gulf, and could only be reached after a voyage of many days. The dynasty of the Antefs and Mentu-hoteps, which terminated with Sankh-ka-ra, was followed by one in which the prevailing names were Usurtasen and Amenemhat. This dynasty is Manetho's twelfth, and the time of its rule has been characterized as "the happiest age of Egyptian history?"[10] The second phase of Egyptian civilization now set in--a phase which is regarded by many as outshining the glories of the first The first civilization had subordinated the people to the monarch, and had aimed especially at eternizing the memory and setting forth the power and greatness of king after king. The second had the benefit and advantage of the people for its primary object; it was utilitarian, beneficent, appealing less to the eye than to the mind, far-sighted in its aims, and most successful in the results which it effected. The wise rulers of the time devoted their energies and their resources, not, as the earlier kings, to piling up undying memorials of themselves in the shape of monuments that "reached to heaven," but to useful works, to the excavation of wells and reservoirs, the making of roads, the encouragement of commerce, and the development of the vast agricultural wealth of the country. They also diligently guarded the frontiers, chastised aggressive tribes, and checked invasion by the establishment of strong fortresses in positions of importance. They patronized art, employing themselves in building temples rather than tombs, and adorned their temples not only with reliefs and statues, but also with the novel architectural embellishment of the obelisk, a delicate form, and one especially suited to the country.