Twelfth Dynasty of Egypt

Definition and stakes

Portrait of Thomas Wallace Knox Thomas Wallace Knox The Boy Travellers in the Far East…

Some of the dynasties of ancient Egypt lasted two hundred years and more, while others were much less, the shortest dynasty being seventy days. During the fourth dynasty, which lasted two hundred years, the Pyramids of Gizeh were built (about 2400 b.c.) . In the twelfth dynasty many monuments and temples were erected, and many of the famous tombs were made; Abraham, and afterward Joseph, came to Egypt, and several important events of Egyptian history belong to this dynasty.
Source: Gutenberg

E. Berkley The Pharaohs and Their People: Scenes of old Egyptian life and history

The close of the twelfth dynasty was followed at no distant date by confusion and disaster. It appears, indeed, that the succeeding dynasty held for a time, at least nominally, the supremacy of Egypt; but sooner or later we find there was a rival dynasty (the fourteenth) ruling at Xois, in the Delta. To the kings composing it is assigned an average length of reign of little over two years, and this has led some to suppose that they were not in any sense Kings of Egypt, but were ruling in the Delta merely as governors—viceroys of foreign invaders.
Source: Gutenberg

Reginald Stuart Poole Littell's Living Age — Volume 141…

Still more when we read the memoirs of the great men of this second age, and take note of the activity of its kings in executing works of national usefulness, we reverse our first judgment, and find that Egypt under the old Thebans had made great strides in civilization beyond the highest point reached by the pyramid-builders. The vast artificial lake of Mœris is a startling proof that the kings of the twelfth dynasty had larger views of the true welfare of Egypt than those who went before them, and had the energy to throw the whole force of the people into works that this foresight suggested.
Source: Wikisource

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