Heartsbane

Heartsbane is the ancestral Valyrian steel blade of House Tarly. The Tarlys have held the blade for some 500 years, and it is usually displayed proudly on a mantle at their seat at Horn Hill.

Season 6
Samwell steals the sword while packing his things and preparing to leave the house with Gilly and their son.

In the books
In the A Song of Ice and Fire novels, Heartsbane has been in the possession of House Tarly for five hundred years. Like Ice, it is a two-handed greatsword. It is currently wielded by Lord Randyll Tarly.