Date palms were one of the first plants cultivated by man. The first written records of date palms being grown and harvested are from about 5000 years ago in ancient Mesopotamia (current day Iraq) along the Tigris and Euphrates rivers. Date palms were also used 6000 years ago near Ur in Southern Iraq in the construction of the temple of the moon god. Archaeological research into ancient dwelling sites of Akadians, Sumerians, and Babylonians has shown that houses of these ancient peoples were roofed with date palm trunks and frond. The scientific name for the date palm is phoenix dactylifera, and it is popularly known simply as the date palm. Although commonly referred to as a "palm tree", date palms are actually a true palm and not a tree. All palms, including the date palm, belong to a group of plants that are known as monocotyledons which include grasses, bamboos, host as, lilies, daffodils, irises, palms, and orchids.