The Chaldeans were originally a nomadic tribe who settled on the plain between the Euphrates and the Tigris, an area that extended some 400 miles in length and about 100 miles in width. The following two paragraphs make reference to the link between the people and the societal class of astrologers and astronomers in southern Mesopotamia: More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.