The Phaistos Disc most likely dating from about 1700 BC. Its purpose and meaning, and even its original geographical place of manufacture remains unknown, making it one of the most famous mysteries of archaeology.
The Middle Kingdom is a period in the history of ancient Egypt stretching from the establishment of the Eleventh Dynasty to the end of the Fourteenth Dynasty, roughly between 1986 BC and 1633 BC.
In 1908 BC he was presumably murdered by his bodyguard and Senuseret, campaigning against Lybian invaders, returned to Iljtawy with haste to prevent a takeover of the government.
Senusret's successor Amenemhat II (1875 BC - 1840 BC) made the position of the nomarchs hereditary again (weakening the centralized government though) and established trade connections with Nubia and a war seems to be conducted in the Levant.