The Citadel of Tiryns is one of the most impressive fortified sites of the LBA Aegean. The initial construction phase appears to have taken place around 1400 BC, but in the mid-13th century BC an extensive expansion was implemented that maximized its defensive capabilities.

Huge walls were erected made of carved limestone blocks according to Cyclopean masonry, turning Tiryns into one of the best-protected sites of the Mycenaean world. Similar monumental fortification projects took place during the same period in Mycenae and Midea.