Lord of the Last Hearth
A Game of Thrones
Lord Jon Umber leads his men when Robb Stark calls the bannermen of House Stark to Winterfell. At first he challenges the young man's authority, threatening to take his forces home if he is placed behind Lords Halys Hornwood or Medger Cerwyn in the order of march. After being called out by Robb, the Greatjon draws his sword, only to have the direwolf Grey Wind knock the sword from his hands and bite off two fingers. Impressed with Robb's courage, the Greatjon makes a joke of it instead of becoming angry and becomes Robb's greatest champion.
Lord Jon participates in the battles of the Whispering Wood and the Camps, where he sets fire to the Ser Jaime Lannister's siege towers. After Riverrun is relieved and news of Lord Eddard Stark's death arrives, the Greatjon is the first to declare Robb the King in the North.
A Clash of Kings
A Storm of Swords
After Robb breaks his marriage contract with the Freys, Greatjon Umber offers to make marriage contracts for his uncles, Mors and Hother, in Robb's place. In Robb's plan to retake Moat Cailin from the ironborn, the Greatjon is given command of the van and told to make his diversionary attack convincing, as Robb's own force is to circle behind Moat Cailin with the guidance of the crannogmen.
During the wedding feast at the Twins, the Greatjon drunkenly sings "The Bear and the Maiden Fair" while musicians perform "Flowers of Spring". He carries Edmure Tully's bride, Roslin Frey, over his shoulder and takes her from the hall as part of the bedding customs.
In preparation for the Freys' betrayal of House Stark, Petyr, Merrett, and Ser Whalen Frey were tasked with getting the Greatjon too drunk to fight. Despite consuming enough alcohol to kill three normal men, when the Red Wedding begins eight men are needed to subdue the Greatjon in chains. He takes the sword of the first man to attack him, kills one, wounds two others, and bites off half the ear of Ser Leslyn Haigh. His son and heir, the Smalljon, is slain during the massacre.
A Feast for Crows
The Greatjon is held captive at the Twins. Following the siege of Riverrun, Jaime informs Ser Edwyn Frey and Walder Rivers that the King Tommen I Baratheon requires the transfer of all captives taken by House Frey in the Red Wedding.
A Dance with Dragons
With the Greatjon still a captive of the Freys, a portion of House Umber, led by his uncle Hother Whoresbane, grudgingly swears fealty to House Bolton, though according to Lord Roose Bolton their loyalty is highly dubious. The other half of the Umbers, under Mors Crowfood, take up the cause of Stannis Baratheon.
Known Lords of the Last Hearth
- Lord Umber, host of Queen Alysanne Targaryen in 58 AC.
- Lord Jon Umber
- Lord Osric Umber
- Lord Harmond Umber
- Lord Hoarfrost Umber
- Lord Jon Umber, known as "the Greatjon", Hoarfrost's grandson and the current Lord of the Last Hearth.
- A Feast for Crows, Appendix.
- A Dance with Dragons, Appendix.
- The World of Ice & Fire, The North: The Kings of Winter.
- Fire & Blood, Jaehaerys and Alysanne - Their Triumphs and Tragedies.
- The World of Ice & Fire, Appendix: Stark Lineage.
- asoiaf.westeros.org: The Wiki-Timeline Project v2 – Comment by Ran (March 16, 2020)
- A Dance with Dragons, Chapter 7, Jon II.
- A Dance with Dragons, Chapter 17, Jon IV.
- A Game of Thrones, Chapter 53, Bran VI.
- A Game of Thrones, Chapter 63, Catelyn X.
- A Game of Thrones, Chapter 69, Tyrion IX.
- A Game of Thrones, Chapter 71, Catelyn XI.
- A Clash of Kings, Chapter 39, Catelyn V.
- A Storm of Swords, Chapter 14, Catelyn II.
- A Storm of Swords, Chapter 45, Catelyn V.
- A Storm of Swords, Chapter 51, Catelyn VII.
- A Storm of Swords, Epilogue.
- A Feast for Crows, Chapter 44, Jaime VII.
- A Dance with Dragons, Chapter 46, A Ghost in Winterfell.
- A Dance with Dragons, Chapter 62, The Sacrifice.
- The World of Ice & Fire, The Wall and Beyond: The Wildlings.