One of Bulgaria’s top Ancient Thrace sites, the Starosel Tomb, has been dated to the 4th century BC after years of research. With German help a team of archaeologists of the Bulgarian National History Museum led by Dr. Ivan Hristov has managed to estimate the timing of the construction of the largest underground temple on the Balkan Peninsula, the Starosel Tomb, located in the Hisarya Municipality, Plovdiv District. In the summer of 2009, the archaeological team took samples from a stake in the middle of the tomb where gifts to the Greek goddess of the hearth Hestia were laid. The radio carbon dating analysis carried out in Heidelberg, Germany, in the laboratory of Dr. Bernd Krommer, have shown that the stake was burned in the period after 358 BC, when the temple was constructed, and the earth was heaped on top of it to form a burial mound. The analysis of the lab research and of the events which happened at that time have given archaeologist Ivan Hristov grounds to conclude that the temple in the village of Starosel, in the so called Chetinyova Mound, and the nearby Thracian ruler’s residence under Mount Kozi Gramadi were built during the reign of the Thracian King Amatokos II (359-351 BC), of the Thracian Odrysian state (5th-3rd century BC. [...]