Krum the Horrible

often referred to as Krum the Fearsome was the Khan of Bulgaria from sometime between 796 and 803 until his death in 814. During his reign the Bulgarian territory doubled in size. His able and energetic rule brought law and order to Bulgaria and developed the rudiments of state organization.
The Byzantine emperor, Leo V the Armenian, offered to negotiate and arranged for a meeting with Krum. As Krum arrived, he was ambushed by Byzantine archers and was wounded as he made his escape. Furious, Krum ravaged the environs of Constantinople and headed home, capturing Adrianople en route, transporting its inhabitants (including the parents of the future Emperor Basil I) across the Danube. In spite of the approach of winter, Krum took advantage of good weather to send a force of 30,000 into Thrace, capturing Arkadioupolis (Lüleburgaz) and carrying off 50,000 captives to the Bulgarian lands across the Danube. The loot from Thrace was used to enrich Krum and his nobility and included architectural elements utilized in the reconstruction of Pliska, perhaps largely by captured Byzantine artisans.
Krum is remembered for instituting the first known written Bulgarian law code, which ensured subsidies to beggars and state protection to all poor Bulgarians. Drinking, slander, and robbery were severely punished. Through his laws he became known as a strict but just ruler, bringing Slavs and Bulgars into a centralized state.
(source Wikipedia)