The Lion Gate was the main entrance of the Bronze Age citadel of Mycenae, southern Greece. It was erected during the 13th century BC in the northwest side of the acropolis and is named after the relief sculpture of two lionesses in a heraldic pose that stands above the entrance. The Lion Gate is the sole surviving monumental piece of Mycenaean sculpture, as well as the largest sculpture in the prehistoric Aegean.
The greater part of the cyclopean wall in Mycenae, including the Lion Gate itself, was built during the second extension of the citadel which occurred in the Late Helladic period IIIA (13th century BC). At that time, the extended fortifications also included Grave Circle A, the burial place of the 16th-century BC royal families inside the city wall. This grave circle was found east of the Lion Gate, where a peribolos wall was also built. After the expansion, Mycenae could be entered by two gates, a main entrance and a postern, while the most extensive feature was undoubtedly the remodeling of the main entrance to the citadel, known as the Lion Gate, in the northwestern side built ca. 1250 BC. The Lion Gate was approached by a partly natural, partly engineered ramp on a northwest-southeast axis. The eastern side of the approach is flanked by the steep smooth slope of the earlier enceinte. This was embellished with a new facade of conglomerate. On the western side a rectangular bastion was erected, 14.80 m (49 ft) long and 7.23 m (24 ft) wide, built in pseudo-ashlar style of enormous blocks of conglomerate. The term "Cyclopean" was therefore applied to imply that the ancient structures had been built by the legendary race of giants whose culture was presumed to have preceded that of the Classical Greeks, as described in their myths. Between the wall and the bastion, the approach narrows to a small open courtyard measuring 15 × 7.23 m (49 × 24 ft), possibly serving to limit the numbers of attackers on the gate. The bastion on the right side of the gate facilitated defensive actions against the attackers' right hand side, which would normally be vulnerable as they would carry their shields on their left arms. At the end of the approach stands the Lion Gate.
The Lion Gate is a massive and imposing construction, standing 3.10 m (10 ft) wide and 2.95 m (10 ft) high at the threshold. It narrows as it rises, measuring 2.78 m (9 ft) below the lintel. The opening was closed by a double door mortised to a vertical beam that acted as a pivot around which the door revolved. The gate itself consists of two great monoliths capped with a huge lintel that measures 4.5×2.0×0.8 m (15×6.6×2.6 ft). Above the lintel, the masonry courses form a corbelled arch, leaving an opening that lightens the weight carried by the lintel. This relieving triangle is a great limestone slab on which two confronted lionesses carved in high relief stand on either sides of a central pillar. The heads of the animals were fashioned separately and are missing. The pillar with circular motifs on its top is placed on an altar-like platform on which the lionesses rest their forepaws. A number of archaeologists suggested that the pillar was a sacred object and a symbol of power for the Mycenaeans, and that the pillar represented their goddess. The imposing gate of the citadel with the representation of the lionesses may have been an emblem of the Mycenaean kings and a symbol of their power. It also has been argued that the lionesses are a symbol of the goddess Hera. The Lion Gate may be compared to the gates of the Hittite Bronze Age citadel of Hattusa, in Asia Minor. Since the heads of the animals were of a different material from their bodies and originally were fashioned to look toward those approaching below, a number of scholars have suggested that they were composite beasts, probably sphinxes, in the typical Middle Eastern tradition. On the top of the pillar is a row of four discs, apparently representing rafters supporting a further piece of sculpture that has since been lost.
The design of the gate had precedents in other surviving artworks of the time; a similar design was depicted on 15th-century Minoan seals and a gem found at Mycenae. Many other pieces of Mycenaean artwork share the same basic pattern of two opposed animals separated by a vertical divider, such as two lambs facing a column and two sphinxes facing a sacred tree representing a deity. Beyond the gate and inside the citadel was a covered court with a small chamber, which probably functioned as a guard post. On the right, adjacent to the wall, was a building that has been identified as a granary because of the pithoi found there containing carbonized wheat.