Early Dynastic Period (Mesopotamia) Early Dynastic Period (Mesopotamia) The Early Dynastic period (abbreviated ED period or ED) is an archaeological culture in Mesopotamia (modern-day Iraq) that is generally dated to c. 2900–2350 BC and was preceded by the Uruk and Jemdet Nasr periods. It saw the invention of writing and the formation of the first cities and states. The ED itself was characterized by the existence of multiple city-states: small states with a relatively simple structure that developed and solidified over time. This development ultimately led to the unification of much of Mesopotamia under the rule of Sargon, the first monarch of the Akkadian
Rye Country Day School a group of parents bought the Seminary in 1917 and established it as a nonprofit day school under the direction of a Board of Trustees. The year 1921 saw the Seminary merge with a boys' school from nearby Harrison, the Rye Country School, and became known as the Rye Country Day Schools. In 1928, the "s" was dropped from the word "Schools". At this time, the School offered a program for girls from kindergarten through grade twelve, and a program for boys from kindergarten through grade nine. In 1964 this pattern of organization was changed when the Board of Trustees