Mob Quad is a four-sided group of buildings from the 13th and 14th centuries in Merton College, Oxford, surrounding a small lawn.
The oldest part is the college's Treasury or Muniment Room that stands above and behind the arch in the north east corner.
The roof of this part is strikingly steep and is made of stone in order to protect it (and its contents) from fire.
The matching North side is probably slightly earlier and apparently stands on the site of the former church of St John, which was no longer needed once the new chapel was complete.
The large dormer windows were added[6] as part of Warden Savile's rebuilding work which began in 1589.