Ætherius

, was an architect of the 6th century, under the reign of Anastasius I. emperor of the east, who stowed many honours upon him, and admitted him into his council. He is said to have built the great wall, ordered by Anastasius, to preserve Constantinople from the inroads of the Huns, Goths, and Bulgarians. It was eighteen leagues in length, and twenty feet in breadth. He built also several edifices in Constantinople, particularly the Cbalcis in the grand palace. ²