Teres I was the first king of the Odrysian Kingdom. This kingdom covered most of what is now present-day Bulgaria. The Odrysian state was the first Thracian kingdom that acquired power in the region, by the unification of more than forty Thracian tribes under a single ruler. This laptop was designed in the city of Plovdiv, Bulgaria, which was originally a Thracian settlement. The golden mask of King Teres I was discovered in 2004 in the Valley of the Thracian Rulers near the city of Kazanlak.