The Valley of Thracian Kings is a term used to describe the numerous Ancient Thracian tumuli (burial mounds) containing tombs and graves in the valley of the Central Bulgarian town of Kazanlak, which was coined by late Bulgarian archaeologist Georgi Kitov, a tracologist (an archaeologist specializing in Ancient Thrace). It is believed that over 1,500 Ancient Thracian burial mounds exist in the Valley of Thracian Kings alone, of which some 300 have been excavated by archaeologists. Not unlike the Valley of the Kings in Egypt, the Valley of the Thracian Kings is where the Thracian rulers and high aristocrats were buried.
The world-famous Kazanlak Tomb was discovered in 1944 (it has been a UNESCO World Heritage Site since 1979). Between 1948 and 1954, Bulgarian archaeologists had the chance to explore one of the capitals of the Ancient Thracians, the ancient city of Seuthopolis. Unfortunately, those were only rescue excavations since the then communist dictatorship in Bulgaria decided it would be a good idea to submerge Seuthopolis on the bottom of the then constructed Koprinka Water Reservoir (present day initiatives for creating an underwater island to exhibit Seuthopolis for tourists have failed to be realized). The Thracian tombs in Maglizh and Kran were discovered in 1965. Thracian tombs from the Roman period (i.e. after Ancient Thrace (at least south of the Danube) was conquered by the Roman Empire in 46 AD) were excavated near the towns of Tulovo and Dabovo in the 1960s. In the 1970s, the team of Dr. M. Domaradski explored a Thracian settlement and a necropolis near the town of Tazha. Between 1992 and 2006, late Bulgarian archaeologist Georgi Kitov led his special archaeological expedition TEMP (Tracology Expedition for Mound Research) which explored over 200 Thracian burial mounds during the Iron Age and the Roman Age in the Kazanlak Valley. The expedition’s finds include over 15 tombs, 3 brick masonry graves, and a number of rich funerals. New discoveries after 2007 of funerals of Thracian aristocrats at Drumeva Mogila Mound near the town of Staro Selo, and Yakimova Mogila Mound near Krushare have extended the Valley of Thracian Kings’ eastward along the Tundzha Valley to the city of Sliven. The traces of civilized life indicate that the Thracians continued many of the traditions of the prehistoric people who inhabited the region in today’s Central Bulgaria. This is evidenced by the Buzovgrad Megalith dating back to 1,800-1,600 BC, and the city of Seuthopolis, which was built on top of a previously existing settlement. More Thracian tumuili have been studied recently near Buzovgrad and Dolno Izvorovo.
Of all the Ancient Thracian burial mounds with their tombs and graves in the Valley of the Thracians Kings, only the Kazanlak Tomb has been recognized as a UNESCO World Heritage Site (since 1979). However, in 2012, Kazanlak Municipality started preparing its application for seeking UNESCO World Heritage Status for several more of the most major Thracian tombs in the Valley of Thracian Kings’ – the Golyama Kosmatka Tomb, the Ostrusha Tomb, the Shushmanets Tomb, the Helvetia Tomb, and the Griffins’ Tomb.