... puteolanus or mortar. This was a mixture of puteoli, lime and water. Puteoli is volcanic ash found near Mt.Vesuvius and was crucial to the construction given that it dries to rock-like hardness. These substances were combined in a wooden trough called a mortarium; for every one-part lime, two or three parts of puteoli were added with water. Coarse gravel and sand ... eldest son, Titus. Titus oversaw the construction for only a few years, before also dying of fever in A.D. 81. Command was then passed onto Titus' younger brother, Domitian, who is known best for completing the construction...

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