<P> Viserys Targaryen is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R.R. Martin, and its television adaptation Game of Thrones . </P> <P> Introduced in 1996's A Game of Thrones, Viserys (along with his younger sister, Daenerys) is one of the last confirmed members of House Targaryen who, until fifteen years before the events of the first novel, ruled on the Iron Throne for nearly three hundred years . </P> <P> Viserys is portrayed by Harry Lloyd in the HBO television adaptation . </P> <P> Viserys Targaryen is the middle child and younger son of Aerys II Targaryen, also known as The Mad King, and his sister - wife Rhaella Targaryen . </P>

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