This drawing by Peter Jackson illustrates one of medieval London’s seven gates in the city wall, which dates from Roman times. During the reign of Henry II, seven double gates were added to better protect the city. Jackson’s drawing depicts the gate as much larger than it actually would have been. The image was created for use in the children’s historical magazine Look and Learn, which may explain why the proportions of the gate itself are exaggerated. In the drawing, the gate appears to rise several stories above the city wall. In reality however, the gates were only about one story taller than the wall itself. The small stream flowing underneath the gate depicted in the drawing is not entirely accurate either. Defensive ditches were dug around the perimeter of the wall, but they were not filled with water. In areas close to the Walbrook river the marshes could provide natural defenses, but the ditches were typically kept dry, although they frequently filled with silt and other debris. Other details of the picture, such as the crenelations of the wall, are accurate to contemporary maps of medieval London.