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The much-anticipated Game of Thrones prequel series, House of the Dragon<\/a>, has finally soared onto our screens, introducing viewers to the ancestors of Daenerys Targaryen, who look set to wage a bloody war over the right to succession and to sit on the Iron Throne.<\/p>\n The heir apparent is Prince Daemon Targaryen<\/a> (Matt Smith), the volatile and violent Commander of the City Watch and brother to King Viserys I Targaryen<\/a> (Paddy Considine), who refuses to condemn his sibling\u2019s actions until it\u2019s too late, setting in motion a chain of events that will lead to a civil war.<\/p>\n The first episode of House of the Dragon, titled The Heirs of the Dragon, makes a number of references to something called Dark Sister, which will go on to play an important part in the looming conflict.<\/p>\n When Prince Daemon first arrives at court, he presents his niece Princess Rhaenyra (Milly Alcock) with a necklace \u2013 a piece of jewellery made, she notes, of Valyrian steel, \u201clike Dark Sister\u201d.<\/p>\n Later, a despondent Daemon is encouraged by his lover and ally Mysaria (Sonoya Mizuno) to fight back against those who\u2019d oppose his ascension to the throne. She reminds the prince that he is no ordinary warrior \u2013 he wields Dark Sister, which puts him a cut above (quite literally).<\/p>\n But what exactly is Dark Sister, and why is it so important to the House of the Dragon mythology? Read on for a potted (or should that be pointed?) history.<\/p> What is Dark Sister in House of the Dragon?<\/strong><\/h2>