A rare surviving iron window grill has been unearthed at the ancient Roman site of Augusta Raurica six miles east of Basel, Switzerland. It is made of five iron bars connected top and bottom by two flat iron strips that provide stability. And the end of the horizontal strips are rings that were probably used to mount the grill to the wooden window frame.
It was discovered 170 cm (67 inches) under the surface during the excavation of a collapsed masonry wall. It is broken into two pieces: three vertical bars and one shorter crossbar on one section, two vertical bars, one long crossbar and one short one on the other section. Two of the original nails used to install it in the window opening survive.
The purpose and age of the structure the wall belonged to are still unknown at this time, but it must have been an outer wall because Roman buildings had very few, small windows only on the outside. Any natural light in the interior of the structure came from open roofs over inner peristyle gardens, courtyards and atria. The windows had grills in them to prevent unwanted visitors from breaking in.
Pane glass was invented in the 1st century A.D., but it was very expensive, so most windows were closed by wooden shutters, or lapis specularis, a thin, translucent layer of selenitic gypsum found in mines in Spain, Sicily, Asia Minor and North Africa. It was lightweight, readily available, came in sheets as much as five feet wide and just as capable of keeping out the elements as glass.
The grill has been recovered from the site and transferred to the collections storeroom of the Augusta Raurica site. Archaeologists will study, document and conserve it there.








