The Thracian rulers have had well-known castles ever since the Ancient Times. The ancient Greeks describe them as "tyursis", meaning "tower" because the high fortified castles could be seen from many miles. However, these were not ordinary fortress towers because the rulers had a big entourage of guards for which there were special buildings with annexes for the horses, the food supply, the carts etc. There are remains of the "tyursis" along Bulgaria. However, the most well-known in the recent years has become Perperikon. The castle was built by the mythical Thracians at least 2 300 years ago. More about 'Short history' : The tracian ancestors The first architectural monuments 150 000 Tracian mounds The first documented resurrection The first sacred male society Writing from the fourth millennia Before Christ The first metallurgists The most ancient gold objects The most ancient masks The sanctuary of Dionisius from XVIII c. B.C. The most skilful ancient healers The Tracians - sea masters of the world Continuity of the tracian spirituality The first Christian church Sofia - the first Christian capital Germans and Tracians - spiritual brothers The arcient Bulgarians Cultural miracle - "A spiritual state" Land of tolerance