From A Wiki of Ice and Fire
|Title||Lord of the Last Hearth|
|Book||A Dance with Dragons (mentioned)|
Hoarfrost Umber was a Lord of the Last Hearth, the grandfather of Greatjon Umber and father of Hother Umber and Mors Umber.
Hoarfrost believed that his youngest son Hother had the making of a maester and therefore sent him to study at the Citadel in Oldtown around 250 AC.
- ↑ 1.0 1.1 A Dance with Dragons, Chapter 17, Jon IV.