Given the question: Information: - thelberht (Old English: "elbrihte"), also called Saint Ethelbert the King, (died 20 May 794 at Sutton Walls, Herefordshire) was an eighth-century saint and a king of East Anglia, the Anglo-Saxon kingdom which today includes the English counties of Norfolk and Suffolk. Little is known of his reign, which may have begun in 779, according to later sources, and very few of the coins issued during his reign have been discovered. It is known from the "Anglo-Saxon Chronicle" that he was killed on the orders of Offa of Mercia in 794. - The Franks (or ') are historically first known as a group of Germanic tribes that inhabited the land between the Lower and Middle Rhine in the 3rd century AD, and second as the people of Gaul who merged with the Gallo-Roman populations during succeeding centuries, passing on their name to modern-day France and becoming part of the heritage of the modern French people. Some Franks raided Roman territory, while other Frankish tribes joined the Roman troops of Gaul. In later times, Franks became the military rulers of the northern part of Roman Gaul. With the coronation of their ruler Charlemagne as ' by Pope Leo III in 800 AD, he and his successors were recognised as legitimate successors to the emperors of the Western Roman Empire. - Cynethryth ("Cynery"; died after AD 798) was a Queen of Mercia and wife of King Offa of Mercia and mother of King Ecgfrith of Mercia. Cynethryth is the only Anglo-Saxon Queen consort in whose name coinage was definitely issued. Biography. Origins. Nothing certain is known of Cynethryth's origins. Her name recalls the wife and daughters of King PendaCynewise, Cyneburh, and Cyneswithwhich may indicate that she was a descendant of Penda. - Charlemagne (2 April 742/747/74828 January 814), also known as Charles the Great or Charles I, was King of the Franks. He united much of Europe during the early Middle Ages and laid the foundations for modern France, Germany and the Low Countries. He took the Frankish throne in 768 and became King of Italy in 774. From 800, he served as the first Holy Roman Emperorthe first recognised emperor in Western Europe since the fall of the Western Roman Empire three centuries earlier. - A burh or burg was an Old English fortification or fortified settlement. In the 9th century, raids and invasions by Vikings prompted Alfred the Great to develop a network of burhs and roads to use against such attackers. Some were new constructions; others were situated at the site of Iron Age hillforts or Roman forts and employed materials from the original fortifications. As at Lundenburh (medieval London), many were also situated on rivers: this facilitated internal lines of supply while aiming to restrict access to the interior of the kingdom for attackers in shallow-draught vessels such as longships. - Ecgfrith was king of Mercia from 29 July to December 796. He was the son of Offa, one of the most powerful kings of Mercia, and Cynethryth. In 787, Ecgfrith had been consecrated king, the first known consecration of an English king, probably arranged by Offa in imitation of the consecration of Charlemagne's sons by the pope in 781. - Eadburh ( Old English : adburh ) , also spelled Eadburg , ( fl . 787 - 802 ) was the daughter of King Offa of Mercia and Queen Cynethryth . She was the wife of King Beorhtric of Wessex , and according to Asser 's Life of Alfred the Great she accidentally killed her husband by poison . She fled to Francia , where she is said to have been offered the chance of marrying Charlemagne , but ruined the opportunity . Instead she was appointed as the abbess of a convent . Here she is said to have fornicated with an English exile . As a result she was eventually expelled from the monastery and ended her days begging in the streets of Pavia . - Offa was King of Mercia, a kingdom of Anglo-Saxon England, from 757 until his death in July 796. The son of Thingfrith and a descendant of Eowa, Offa came to the throne after a period of civil war following the assassination of thelbald. Offa defeated the other claimant, Beornred. In the early years of Offa's reign, it is likely that he consolidated his control of Midland peoples such as the Hwicce and the Magonste. Taking advantage of instability in the kingdom of Kent to establish himself as overlord, Offa also controlled Sussex by 771, though his authority did not remain unchallenged in either territory. In the 780s he extended Mercian supremacy over most of southern England, allying with Beorhtric of Wessex, who married Offa's daughter Eadburh, and regained complete control of the southeast. He also became the overlord of East Anglia and had King thelberht II of East Anglia beheaded in 794, perhaps for rebelling against him. - Francia or Frankia, also called the Kingdom of the Franks, Frankish Kingdom, Frankish Empire, Frankish Realm or occasionally Frankland, was the territory inhabited and ruled by the Franks, a confederation of West Germanic tribes, during Late Antiquity and the Early Middle Ages. - Late Antiquity is a periodization used by historians to describe the time of transition from classical antiquity to the Middle Ages in mainland Europe, the Mediterranean world, and the Middle East. The development of the periodization has generally been accredited to historian Peter Brown, after the publication of his seminal work "The World of Late Antiquity" (1971). Precise boundaries for the period are a continuing matter of debate, but Brown proposes a period between the 3rd and 8th centuries AD. Generally, it can be thought of as from the end of the Roman Empire's Crisis of the Third Century (c. 235 284) to, in the East, the early Islamic period (7th9th centuries), following the Muslim conquests in the mid7th century. In the West the end was earlier, with the start of the Early Medieval period typically placed in the 6th century, or earlier on the Western edges of the empire. - France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, and from the Rhine to the Atlantic Ocean. Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans and had a total population of almost 67 million people as of January 2017. It is a unitary semi-presidential republic with the capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse and Bordeaux. - Asser (died c. 909) was a Welsh monk from St David's, Dyfed, who became Bishop of Sherborne in the 890s. About 885 he was asked by Alfred the Great to leave St David's and join the circle of learned men whom Alfred was recruiting for his court. After spending a year at Caerwent because of illness, Asser accepted. - Alfred the Great ("elf counsel" or "wise elf"; 849 26 October 899) was King of Wessex from 871 to 899. - The Roman Empire (Koine and Medieval Greek: , tr. ) was the post-Roman Republic period of the ancient Roman civilization, characterized by government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, Africa and Asia. The city of Rome was the largest city in the world BC AD, with Constantinople (New Rome) becoming the largest around 500 AD, and the Empire's populace grew to an estimated 50 to 90million inhabitants (roughly 20% of the world's population at the time). The 500-year-old republic which preceded it was severely destabilized in a series of civil wars and political conflict, during which Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title "Augustus", effectively marking the end of the Roman Republic. Given the paragraphs above, decide what entity has the relation 'brother' with 'ecgfrith of mercia'.
The answer is:
eadburh