Viserys Targaryen

Viserys Targaryen, called The Beggar King, is the heir of his father Aerys II and brother Rhaegar after their deaths during Robert's Rebellion. The war, however, turned him into an exile who plots to regain control of the Iron Throne. He styles himself as Viserys Targaryen, the Third of His Name, King of the Andals, the Rhoynar and the First Men, Lord of the Seven Kingdoms and Protector of the Realm.

History
Viserys was a young boy at the time of Robert's Rebellion. When his brother Rhaegar was defeated upon the Trident, Viserys and his pregnant mother, Rhaella, were evacuated to Dragonstone. After the death of his mother and the end of the war, Viserys and his sister, Daenerys, were smuggled to Braavos by the loyalist Ser Willem Darry. There they lived under Ser Willem's protection until his death.

Ser Willem's servants later evicted the last Targaryens, forcing them to wander the Free Cities as guests of powerful citizens. Their welcome eventually faded, and they were forced to sell off their possessions to survive, even Rhaella's crown. When Viserys sold his mother's crown the last joy had gone from him, leaving only rage, men started calling him The Beggar King. While his relationship with his sister was initially warm, Viserys grew to resent Daenerys for killing their mother during her birth, and began treating her poorly. He would frequently warn her not to "wake the dragon" and incite his anger.

Viserys is an ambitious man but also impatient, delusional and blind to reality. He sees himself as a rightful King due instant respect and admiration and takes anything less as an insult. He refuses to accept the reality of House Targaryen's situation when Robert Baratheon took the Iron Throne. Viserys believes that among the houses that would rise for him upon his landing would be the Tyrells, Redwynes, Darrys, Greyjoys, and Martells.

While there is no question that Viserys is blind to the desperate reality of his situation, the Darrys were still displaying Targaryen tapestries fifteen years after Robert's Rebellion, and even a peasant spoke of better days in the past under King Aerys, during the march of captives to Harrenhal.

Game of Thrones
In Pentos, Viserys meets Illyrio Mopatis, who takes an interest in returning Viserys to the Iron Throne in return for rewards upon his ascension. Illyrio and Viserys arrange a marriage between Daenerys and Khal Drogo, a powerful Dothraki horselord who promises Viserys 10,000 men to conquer the Seven Kingdoms. Viserys, while willing to wed Daenerys to Drogo, is also resentful of having to give her up, and the night before the wedding tries to enter her room and at least claim her virginity. Illyrio, however, had the foresight to post guards on her room so this would not happen and ensure the impetuous Viserys didn't undo years of planning on Illyrio's part.

Viserys insists on traveling with Drogo to ensure the Khal honors the agreement. Illyrio tries to stop him by offering Viserys the use of his manse, but Viserys declines. Viserys believes that Drogo is delaying fulfilment of his promise and Viserys grows increasingly insistent on making a start to the invasion. Viserys believes he sold Dany to Drogo and that the Khal has not paid him for her. As Ser Jorah Mormont explains, the Dothraki do not buy or sell, but rather receive gifts and give gifts back eventually in return. He refuses to listen to Illyrio and Ser Jorah, who tell him repeatedly that the Khal sees Daenerys as a gift, and would give Viserys a gift (an army) in return, but only in the Khal's own time. Viserys is too foolish and impatient to listen.

He tries to browbeat Daenerys into persuading Drogo, but with her new position of authority as khaleesi she begins standing up for herself. After he tries to hit Daenerys, she has his horse taken away, forcing Viserys to walk. This is taboo amongst Dothraki as a man who is not on horseback is no man at all, and earns him the mocking nickname Khal Rhae Mhar, "The Sorefoot King". Khal Drogo later offers him a place in a cart and Viserys accepts, in his ignorance believing it the Khal's way of apologizing to him for the wrong Dany did to him; unknown to Viserys, this is a greater insult then walking on foot, as carts are for cripples, eunuchs, the very old or very young, earning Viserys the new nickname Khal Rhaggat, "The Cart King". At Vaes Dothrak, Viserys gets drunk and again insists that Drogo give him his crown. Viserys draws a sword — banned in the sacred city of Vaes Dothrak as it is forbidden to shed a free man's blood there — and threatens Daenerys's unborn child. In response, Drogo announces that he is giving Viserys his crown; he melts down his belt of golden medallions and upends the pot over Viserys's head, fatally "crowning" him, though not one drop of blood is split in doing so.