Bjorn Tall-Trunks (842-) was a Dublin Norse Viking raider and lord during the late 9th century AD. A vassal of Ivar the Boneless from 868 AD, Bjorn was the ruler of the small village of Dubh Linn By North, but he spent most of his days raiding monasteries, fighting bandits, and - occasionally - being held prisoner in the British Isles, Frisia, and Scandinavia. Bjorn was an unsuccessful general, as he was often taken captive by larger armies from Alt Clut and Gwynedd, but he was a successful adventurer and raider who quickly rebuilt his wealth and warband after each setback. Bjorn first gained notoriety with his Sack of Gleann Da Loch, but this ironically led to the Abbot of Finian Toimilin Ó Fágáin discovering him and hiring him to kill the Ailech claimant "The Snake". He achieved greater success in Denmark than in Britannia and Ireland, winning several victories against raiding Franks and selling their valuables for high prices in Ribe. He later returned to Wales and helped the Abbot locate the two young grandchildren of a deceased claimant to the throne, and he was later introduced to the Abbot's patron, Mael Bressail, at the city of Aileach in Ailech. He also held his first major command during the Siege of Luighne Connacht, helping in the taking of the city before his desertion by King Gofraid of Lochlann led to him losing the city to an Irish counterattack. He also fought alongside the King at the Battle of Sligo, fighting bravely and nearly winning the battle before the Irish army's numerical superiority won the day for the Celts. While at the court of Ailech, Bjorn decided to convert to Christianity to mend his relations with the Christian realms, as he tired of coming under attack from ever non-pagan kingdom whenever he navigated his way through them.