The first sword forged from the melted down Valyrian steel of Ice was given by Tywin to his son Jaime Lannister. The new sword had a golden lion's head hilt and was intended by Tywin to be Jaime's weapon as the new Lord of Casterly Rock. When Jaime refused to step down as Lord Commander of the Kingsguard, Tywin dejectedly told him to keep the sword anyway.
Later, Jaime gave the sword to Brienne of Tarth when he charged her with the mission to locate Sansa Stark and keep her safe away from his twin sister Cersei. Because she had previously sworn an oath to the late Catelyn Stark to keep her daughters Sansa and Arya safe, Brienne decided to name the sword Oathkeeper. Brienne would wield Oathkeeper when she defeated Sandor Clegane AKA The Hound in battle, and she used Oathkeeper to execute Stannis Baratheon after his failure to take Wintefell from Ramsay Bolton.
In season 6, Jaime and Brienne would reunite during the Lannisters and Freys' siege to take Rivverun from the Blackfish. Brienne attempted to return Oathkeeper to Jaime, but he told her to keep it: "It's yours. It will always be yours."
The second Valyrian steel sword forged from Ice was a gift from Tywin to his grandson King Joffrey at the breakfast before his wedding to Margaery Tyrell. The sword's hilt features the stag of House Baratheon, ornamented with the gold of House Lannister. Joffrey's first use of the sword, which he named Widow's Wail, was to slice up the book his hated uncle Tyrion gave him as a wedding present. Joffrey later used Widow's Wail to cut open the giant pigeon pie at his wedding feast moments before he was murdered by poison by Lady Olenna Tyrell. Widow's Wail was placed with Joffrey's corpse at his funeral in the Great Sept of Baelor. The sword was not seen again until the third episode of season 7, 'The Queen's Justice,' and is now carried by Jaime Lannister as his weapon.
Heartsbane is the ancestral sword of House Tarly of Horn Hill. With a hilt shaped like a bow and arrow to reflect Tarly family sigil - the Huntsman - Heartsbane has been in the Tarly family for 500 years. The sword was intended to be passed down from the current patriarch, Lord Randyll Tarly, to his firstborn son. However, since his firstborn son is Samwell Tarly, whom Randyll despises, he planned to ignore this tradition and pass the son to his second son Dickon Tarky, who will inherit Horn Hill. When he visited Horn Hill with Gilly in season 6, Sam stole Heartsbane and took it with him to the Citadel.
Longclaw, now in the possession of Jon Snow, was for five centuries the ancestral sword of House Mormont of Bear Island. Jeor Mormont, Lord Commander of the Night's Watch, gifted the sword to Jon Snow after Jon saved his life from a wight in season 1. Mormont had the pommel remade from a bear to the shape of a direwolf. Jon has wielded Longclaw ever since, occasionally losing and regaining it in the course of his many adventures.
In season 5, Jon used Longclaw to execute Janos Slynt, and in the battle of Hardhome, Jon is shocked when Longclaw is able to shatter and kill a White Walker, proving something besides dragonglass can kill the dead. Before he ended his watch as Lord Commander in season 6, the magically resurrected Jon used Longclaw to cut the rope that hanged the Night's Watchmen who murdered him.
Now that Jon Snow is King in the North, Longclaw is poised to replace Ice as the ancestral sword of the Starks of Winterfell - though how the long-awaited reveal of Jon Snow's true Targaryen heritage will affect this remains to be seen.
Just how many of these Valyrian steel weapons will be put to use in battle against the White Walkers is a question Game of Thrones fans can't wait to have answered.
Game of Thrones' seventh season continues Sundays @ 9pm on HBO, HBO Go, and HBO NOW.