Answer the following question: Information:  - Krum was the Khan of Bulgaria from sometime after 796 but before 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 organisation.  - Nikephoros I or Nicephorus I , also Logothetes or Genikos ( Greek :    , Nikphoros I , `` Bringer of Victory '' ; died July 26 , 811 ) , was Byzantine Emperor from 802 to 811 AD , when he was killed in the Battle of Pliska . A patrician from Seleucia Sidera , Nikephoros was appointed finance minister ( logothets tou genikou ) by the Empress Irene . With the help of the patricians and eunuchs he contrived to dethrone and exile Irene , and to be chosen as Emperor in her stead on October 31 , 802 . He crowned his son Staurakios co-emperor in 803 . His rule was endangered by Bardanes Tourkos , one of his ablest generals , who revolted and received support from other commanders , notably the later emperors Leo V the Armenian and Michael II the Amorian in 803 . But Nikephoros gained over the latter two , and by inducing the rebel army to disperse achieved the submission of Bardanes , who was blinded and relegated to a monastery . A conspiracy headed by the patrician Arsaber had a similar issue . Nikephoros embarked on a general reorganization of the Empire , creating new themes in the Balkans ( where he initiated the re-Hellenization by resettling Greeks from Anatolia ) and strengthening the frontiers . Needing large sums to increase his military forces , he set himself with great energy to increase the Empire 's revenue . By his rigorous tax imposts he alienated the favour of his subjects , and especially of the clergy , whom he otherwise sought to control firmly . Although he appointed an iconodule , Nikephoros as patriarch , Emperor Nikephoros was portrayed as a villain by ecclesiastical historians like Theophanes the Confessor . In 803 Nikephoros concluded a treaty , called the `` Pax Nicephori '' , with Charlemagne , but refused to recognize the latter 's imperial dignity . Relations deteriorated and led to a war over Venice in 806 -- 810 . In the process Nikephoros had quelled a Venetian rebellion in 807 , but suffered extensive losses to the Franks . The conflict was resolved only after Nikephoros ' death ,...  - The Battle of Pliska or Battle of Vrbitsa Pass was a series of battles between troops, gathered from all parts of the Byzantine Empire, led by the Emperor Nicephorus I Genik, and Bulgaria, governed by Khan Krum. The Byzantines plundered and burned the Bulgar capital Pliska which gave time for the Bulgarians to block passes in the Balkan Mountains that served as exits out of Bulgaria. The final battle took place on 26 July 811, in some of the passes in the eastern part of the Balkans, most probably the Vrbitsa Pass. There, the Bulgarians used the tactics of ambush and surprise night attacks to effectively trap and immobilize the Byzantine forces, thus annihilating almost the whole army, including the Emperor. After the battle, Krum encased Nicephorus's skull in silver, and used it as a cup for wine-drinking. This is one of the best documented instances of the custom of the skull cup.  - The Balkan mountain range (Bulgarian and , Latin Serbian Stara planina, "Old Mountain"; ) is a mountain range in the eastern part of the Balkan Peninsula. The Balkan range runs 560 km from the Vrashka Chuka Peak on the border between Bulgaria and Serbia eastward through central Bulgaria to Cape Emine on the Black Sea. The highest peaks of the Balkan Mountains are in central Bulgaria. The highest peak is Botev at 2,376 m, which makes the mountain range the third highest in the country, after Rila and Pirin. The mountains are the source of the name of the Balkan Peninsula.   - Pliska (, romanized: "Plskov") is the name of both the first capital of the First Bulgarian Empire and a small town situated 20 km Northeast of the provincial capital Shumen.  - The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire in the East during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Istanbul, which had been founded as Byzantium). It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453. During most of its existence, the empire was the most powerful economic, cultural, and military force in Europe. Both "Byzantine Empire" and "Eastern Roman Empire" are historiographical terms created after the end of the realm; its citizens continued to refer to their empire as the "Roman Empire" (tr. ), or "Romania", and to themselves as "Romans".  - The First Bulgarian Empire (Old ) was a medieval Bulgarian state that existed in southeastern Europe between the 7th and 11th centuries AD. It was founded circa 681 when Bulgar tribes led by Asparukh moved to the northeastern Balkans. There they secured Byzantine recognition of their right to settle south of the Danube by defeating  possibly with the help of local South Slavic tribes  the Byzantine army led by Constantine IV. At the height of its power, Bulgaria spread from the Danube Bend to the Black Sea and from the Dnieper River to the Adriatic Sea.    What is the relationship between 'nikephoros i' and '26 july 811'?
Answer:
date of death