Question: What brother of Ivar the Boneless was a Viking warrior in the middle of the 9th Century?

Context paragraphs:
Birka female Viking warrior: The Birka female Viking warrior was a woman buried in the 10th century with the accoutrements of a Viking warrior in Birka, Sweden.  Thought to be a male warrior since the grave's excavation in 1889, the remains have been proved to be female by DNA studies in 2017.  The study concludes the artifacts buried with the woman are evidence she was a high-ranking warrior.  That conclusion has been disputed as premature by archaeologists who say it is not evidence that women were warriors in patriarchal Viking culture.  This controversy has contributed to the debate about the roles of women in Viking society.

St Mary's Church, Reculver: St Mary's Church, Reculver, was founded in the 7th century as either a minster or a monastery on the site of a Roman fort at Reculver, which was then at the north-eastern extremity of Kent in south-eastern England.  In 669, the site of the fort was given for this purpose by King Ecgberht of Kent to a priest named Bassa, beginning a connection with Kentish kings that led to King Eadberht II of Kent being buried there in the 760s, and the church becoming very wealthy by the beginning of the 9th century.  From the early 9th century to the 10th the church was treated as essentially a piece of property, with ownership passing between kings of Mercia and Wessex and the archbishops of Canterbury.  Viking attacks may have extinguished the church's religious community in the 9th century, although an early 11th-century record indicates that the church was then in the hands of a dean accompanied by monks. By the time of Domesday Book, completed in 1086, St Mary's was serving as a parish church.

Ormside bowl: The Ormside Bowl is an Anglo-Saxon double-bowl in gilded silver and bronze, with glass, perhaps Northumbrian, dating from the mid-8th century which was found in 1823, possibly buried next to a Viking warrior in Great Ormside, Cumbria, though the circumstances of the find were not well recorded.  If so, the bowl was probably looted from York by the warrior before being buried with him on his death.  The bowl is one of the finest pieces of Anglo-Saxon silverwork found in England.

John DeSantis: John DeSantis (born January 21, 1977) is a Canadian actor, perhaps best known as Lurch on Fox Family's television of "The New Addams Family".  His other work includes a principal role in Disney's Touchstone Pictures film "The 13th Warrior", in which he played a Viking warrior named Ragnar the Dour.  He has also appeared in television series "" and "Supernatural".  DeSantis is (6'10") tall.  Before his acting career, he served for two years in the Canadian Army.  He has been recognised as one of Canada's tallest actors.

Early Scandinavian Dublin: The First Viking Age in Ireland began in 795, when Vikings began carrying out hit-and-run raids on Gaelic Irish coastal settlements.  Over the following decades the raiding parties became bigger and better organized; inland settlements were targeted as well as coastal ones; and the raiders built naval encampments known as longphorts to allow them to remain in Ireland throughout the winter.  In the mid 9th century, Viking leader Turgeis or "Thorgest" founded a stronghold at Dublin, plundered Leinster and Meath, and raided other parts of Ireland.  He was killed by the High King, Máel Sechnaill mac Máele Ruanaid, which was followed by several Irish victories against the Vikings and the seizure of Dublin in 849.  Shortly after, a new group of Vikings known as the Dubgaill ("dark foreigners") came to Ireland and clashed with the earlier Viking settlers, now called the Finngaill ("fair foreigners").  The wavering fortunes of these three groups and their shifting alliances, together with the shortcomings of contemporary records and the inaccuracy of later accounts, make this period one of the most complicated and least understood in the fledgling city's history.  In 853 a Viking warlord called Amlaíb (, possibly Olaf the White) arrived and made himself king of Dublin.  He ruled along with his brothers Ímar ("Ívarr", possibly Ivar the Boneless) and Auisle ("Ásl").  For the next fifteen years or so, they used Dublin as their base for a series of campaigns against Irish kingdoms.  During these conflicts they briefly allied themselves with several Irish kings.  The Dublin Vikings also carried out a number of raids in Britain at this time.  The deaths of Ivar (c.873) and Olaf (c.874) were followed by internecine conflict among the Vikings.  Although intermittent warfare between the Vikings and the Irish continued, these inner conflicts weakened the Viking colonies and made it easier for the Irish to unite against them.  In 902, Cerball mac Muirecáin, king of Leinster, and Máel Findia mac Flannacáin, king of Brega, launched a two-pronged attack on Dublin and drove the Vikings from the city.  However, in 914 the Vikings now known as the Uí Ímair (House of Ivar) would return to Ireland, marking the beginning of the Second Viking Age.

Ímar: Ímar (Old Norse: "Ívarr" ; died c. 873) was a Viking leader in Ireland and Scotland in the mid-late ninth century who founded the Uí Ímair dynasty, and whose descendants would go on to dominate the Irish Sea region for several centuries.  He was the son of the king of Lochlann, identified in the non-contemporary "Fragmentary Annals of Ireland" as Gofraid.  The "Fragmentary Annals" name Auisle and Amlaíb Conung as his brothers.  Another Viking leader, Halfdan Ragnarsson, is considered by some scholars to be another brother.  The Irish Annals title Amlaíb, Ímar and Auisle "kings of the foreigners".  Modern scholars use the title "kings of Dublin" after the Viking settlement which formed the base of their power.  Some scholars consider Ímar to be identical to Ivar the Boneless, a Viking commander of the Great Heathen Army named in contemporary English sources who also appears in the Icelandic sagas as a son of the legendary Viking Ragnar Lodbrok.

Ivar the Boneless: Ivar the Boneless (Old Norse: "Ívarr hinn Beinlausi" ; ) was a Viking leader and a commander who invaded what is now England.  According to the "Tale of Ragnar Lodbrok", he was the son of Ragnar Lodbrok and Aslaug.  His brothers included Björn Ironside, Halfdan Ragnarsson, Hvitserk, Sigurd Snake-in-the-Eye and Ubba.

Odda, Ealdorman of Devon: Odda, also known as Oddune, was a ninth-century ealdorman of Devon.  He is known for his victory at the Battle of Cynwit in 878, where his West Saxon forces defeated a Viking army led by Ubba, brother of the Viking chiefs Ivar the Boneless and Halfdan Ragnarsson.

Sigurd Snake-in-the-Eye: Sigurd Snake-in-the-eye (Old Norse: Sigurðr ormr í auga) was a Viking warrior in the middle of the 9th Century.  He was one of the sons of the legendary Viking Ragnar Lothbrok.

The Strongbow Saga: The Strongbow Saga is a historical fiction series by Judson Roberts.  The Saga tells the story of Halfdan Hroriksson, a young Viking trying to avenge his brother's murder.  The series weaves the story of the fictional Halfdan into the lives of actual historical figures of the period, including famous Viking leaders Ragnar Lodbrok, Ivar the Boneless, Bjorn Ironside, and Hastein, as well as Frankish leaders King Charles the Bald and Count Robert the Strong.  Actual historical events form a backdrop for parts of the story, including a Danish attack up the Seine River in the year 845 which was reported in several contemporary Frankish sources, including the Annals of St. Bertin.

Supporting paragraphs: Ivar the Boneless Sigurd Snake-in-the-Eye
Answer: Sigurd Snake-in-the-Eye