for the end of LHIIIB is 1200/1190 BC. The beginning of LHIIIC, therefore, is now commonly set into the reign of Queen Twosret. The LHIIIC has been divided into LHIIIC:1 and LHIIIC:2 by Furumark, based on materials from tombs in Mycenae, Asine, Kephalonia, and Rhodes. In the 1960s, the excavations of the citadel at Mycenae and of Lefkandi in Euboea yielded stratified material revealing significant regional variation in LHIIIC, especially in the later phases. Late LHIIIC pottery is found in Troy VIIa and a few pieces in Tarsus. It was also made locally in the Philistine settlements of Ashdod, Ashkelon, Ekron, Gath, and Gaza. Fortified settlements During the Helladic period, a number of major advances were developed including fortified urban settlements with monumental buildings such as corridor houses, which may prove the existence of complex societies organized by an elite or at least achieving corporate, proto-city state form. One of these settlements was Manika, located in Euboea, dated to the Early Helladic period II (2800–2200 BC). The settlement covered an area of 70–80 hectares, was inhabited by 6,000–15,000 people, and was one of the largest settlements of the Bronze Age in Greece. Another settlement was Lerna in the Argolid region, which was perhaps the most important and wealthiest of Early Helladic sites. The settlement has a monumental building known as the House of the Tiles, a "corridor house", notable for several architectural features that were advanced for its time, such as its roof being covered by baked tiles, which gave the building its name. The structure dates to the Early Helladic II period (2500–2300 BC) and is sometimes interpreted as the dwelling of an elite member of the community, a proto-palace, or an administrative center. Alternatively, it has also been considered to be a communal structure or the common property of the townspeople. The exact functions of the building remain unknown due to a lack of small finds indicating the specific uses of the building. The house had a stairway leading to a second story, and was protected by a tiled roof. Debris found at the site contained thousands of terracotta tiles having fallen from the roof. Although such roofs were also found in the Early Helladic site of Akovitika, and later in the Mycenaean towns of Gla and Midea, they only became common in Greek architecture in the 7th century BC. The walls of the House of the Tiles