Hadrian was an ancient Roman emperor who is best known for building the wall that bears his name, the Hadrian's Wall. A BRICKLAYER is a skilled tradesperson who specializes in laying bricks to construct walls, buildings, and other structures. The INCA were an ancient South American civilization that built many impressive structures, including walls, using stone masonry techniques. Noah was a biblical figure who is said to have built an ark to save himself and his family from a great flood. A mason is a skilled tradesperson who specializes in constructing structures out of stone, brick, and other materials. Together, these five terms all relate to the job of building walls.