in the largest room at Sagalassos's Roman baths. The cross-shaped room measures 1,250 sq m (13,500 sq ft), is covered in mosaics and was probably used as a frigidarium - a room with a cold pool which Romans could sink into after a hot bath. It was partially destroyed in an earthquake between 540AD and 620AD, filling the room with rubble. Archaeologists have been excavating the frigidarium for the past 12 years. The dig is part of wider excavations at the ruined city, which was once an important regional centre. Imperial gallery Last year, the team led by Prof Marc Waelkens, from the Catholic University of Leuven in Belgium, uncovered fragments of a colossal marble statue of the emperor Hadrian in the rubble. This month, the researchers founda huge head and arm belonging to Faustina the Elder - wife of the emperor Antoninus Pius. Archaeologists now think the room hosted a gallery of sculptures depicting the "Antonine dynasty" - rulers of Spanish origin who presided over the Roman Empire during the second century AD. The emperor wore army boots decorated with lion skins Early on 20 August, a huge pair of marble lower legs, broken just above the knee, turned up in the debris. They also found a 1.5m-long (5ft-long) right arm and hand holding a globe which was probably once crowned by a gilded bronze "Victory" figure. But it was the giant marble head which identified this statue as the young Marcus Aurelius. The colossal head, which is just under 1m (3ft) in height,