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''The Assyrians and Babylonians used clay for this purpose, and the Egyptians advanced to the discovery of lime and gypsum mortar as a binding agent for building such structures as the Pyramids.

''The Assyrians and Babylonians used clay for this purpose, and the Egyptians advanced to the discovery of lime and gypsum mortar as a binding agent for building such structures as the Pyramids. The Greeks made further improvements and finally the Romans developed a cement that produced structures of remarkable durability.'' [http://www.rumford.com/articlemortar.html A History of Cement]

The Greeks made further improvements and finally the Romans developed a cement that produced structures of remarkable durability.'' [http://www.rumford.com/articlemortar.html A History of Cement]

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