Krum (, ), 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, spreading from the middle Danube to the Dnieper and from Odrin to the Tatra Mountains. His able and energetic rule brought law and order to Bulgaria and developed the rudiments of state organization. Biography Origins Krum was a Bulgar chieftain from Pannonia. His family background and the surroundings of his accession are unknown. It has been speculated that Krum might have been a descendant of the old Bulgar royal house of Kubrat. The name Krum is of Turkic origin and means "governor prince" (from kurum "rule, leadership, administration"). Establishment of new borders Around 805, Krum defeated the Avar Khaganate to destroy the remainder of the Avars and to restore Bulgar authority in Ongal again, the traditional Bulgar name for the area north of the Danube across the Carpathians covering Transylvania and along the Danube into eastern Pannonia. This resulted in the establishment of a common border between the Frankish Empire and Bulgaria, which would have important repercussions for the policy of Krum's successors. Conflict with Nikephoros I Krum engaged in a policy of territorial expansion. In 807 Bulgarian forces defeated the Byzantine army in the Struma valley. In 809 Krum besieged and forced the surrender of Serdica, slaughtering the garrison of 6,000 despite a guarantee of safe conduct. This victory provoked Byzantine Emperor Nikephoros I to settle Anatolian populations along the frontier to protect it and to attempt to retake and refortify Serdica, although this enterprise failed. In early 811, Nikephoros I undertook a massive expedition against Bulgaria, advancing to Marcellae (near Karnobat). Here Krum attempted to negotiate on 11 July 811, but Nikephoros was determined to continue with his plunder. His army somehow avoided Bulgarian ambushes in the Balkan Mountains and made its way into Moesia. They managed to take over Pliska on 20 July, as only a small, hastily assembled army was in their way. Here Nikephoros helped himself to the treasures of the Bulgarians while setting the city afire and turning his army on the population. A new diplomatic initiative from Krum was rebuffed. The chronicle of the 12th-century patriarch of the Syrian Jacobites, Michael the Syrian, describes the brutalities and atrocities of Nikephoros: "Nikephoros, emperor of the Byzantine empire, walked