Question: Auisle or Óisle, was a Viking leader in Ireland and Scotland in the mid-late of which century, a nother Viking leader, Halfdan Ragnarsson, is sometimes considered a brother?

<P0-S0> Halfdan Ragnarsson (Old Norse: "Hálfdan" ; or "Healfdene"; Old Irish: "Albann" ; died 877) was a Viking leader and a commander of the Great Heathen Army which invaded the Anglo-Saxon kingdoms of England, starting in 865. <P0-S1>  According to the tradition recorded in the Norse sagas he was one of the sons of Ragnar Lodbrok, and his brothers included Björn Ironside, Ivar the Boneless, Sigurd Snake-in-the-Eye and Ubba. <P0-S2>  He was the first Viking King of Northumbria and a pretender to the throne of Kingdom of Dublin. <P0-S3>  He died at the Battle of Strangford Lough in 877 trying to press his Irish claim. <SEP> <P1-S0> Auisle or Óisle (Old Norse: "Ásl "or" Auðgísl" ; died c. 867) was a Viking leader in Ireland and Scotland in the mid-late ninth century. <P1-S1>  He was the son of the king of Lochlann, identified in the non-contemporary "Fragmentary Annals of Ireland" as Gofraid, and brother of Amlaíb Conung and Ímar, the latter of whom founded the Uí Ímair dynasty, and whose descendants would go on to dominate the Irish Sea region for several centuries. <P1-S2>  Another Viking leader, Halfdan Ragnarsson, is sometimes considered a brother. <P1-S3>  The Irish Annals title Auisle, Ímar and Amlaíb "kings of the foreigners". <P1-S4>  Modern scholars use the title "kings of Dublin" after the Viking settlement which formed the base of their power. <SEP> <P2-S0> Amlaíb Conung (Old Norse: "Óláfr" ; died c. 874) was a Viking leader in Ireland and Scotland in the mid-late ninth century. <P2-S1>  He was the son of the king of Lochlann, identified in the non-contemporary "Fragmentary Annals of Ireland" as Gofraid, and brother of Auisle and Ímar, the latter of whom founded the Uí Ímair dynasty, and whose descendants would go on to dominate the Irish Sea region for several centuries. <P2-S2>  Another Viking leader, Halfdan Ragnarsson, is considered by some scholars to be another brother. <P2-S3>  The Irish Annals title Amlaíb, Ímar and Auisle "kings of the foreigners". <P2-S4>  Modern scholars use the title "kings of Dublin" after the Viking settlement which formed the base of their power. <P2-S5>  The epithet "Conung" is derived from the Old Norse "konungr" and simply means "king". <P2-S6>  Some scholars consider Amlaíb to be identical to Olaf the White, a Viking sea-king who features in the "Landnámabók" and other Icelandic sagas. <SEP> <P3-S0> 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. <P3-S1>  He was the son of the king of Lochlann, identified in the non-contemporary "Fragmentary Annals of Ireland" as Gofraid. <P3-S2>  The "Fragmentary Annals" name Auisle and Amlaíb Conung as his brothers. <P3-S3>  Another Viking leader, Halfdan Ragnarsson, is considered by some scholars to be another brother. <P3-S4>  The Irish Annals title Amlaíb, Ímar and Auisle "kings of the foreigners". <P3-S5>  Modern scholars use the title "kings of Dublin" after the Viking settlement which formed the base of their power. <P3-S6>  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.