Dark Sister
From A Wiki of Ice and Fire
Dark Sister is a famous sword of Valyrian Steel. It was owned by House Targaryen.
History
The sword was in the possession of Aegon I's sister and wife, Visenya Targaryen. It was probably passed through the Targaryen line by inheritance. It was famously wielded by Prince Aemon the Dragonknight. It later came into the possession of Lord Bloodraven. [1] It is unknown if Bloodraven was allowed to take the sword with him when he was sent to the Wall. Since then nothing is known of its whereabouts.