Gla (Greek: Γλα or Γλας): Mycenaean fortress in Boeotia.
The ("cyclopic") walls, made of blocks of natural stone, are 2¾ km long, which makes Gla a very big city. It was larger than, for example, Mycene or Tiryns. The pottery can be dated to the Late Helladic IIIB period, which is more or less identical to the thirteenth century BCE.Inside the fortress, the remains of a large building (a palace?) and a market place with long work- and store-rooms have been identified.
The pottery suggests that the site was again in use in the Byzantine age.