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Babies or no, theirs was the same cursed blood that flowed within the Mad King's veins. They were 'dragon-spawn', and couldn't be allowed to survive. What would they grow to be, loyal subjects?...Was it a crime to put an end to a family of lunatics born of incest?
In A Song of Ice and Fire novels and its TV series adaptation, the Mad Targaryens refers to insane members of the royal family faction House Targaryen affected by the so-called "Targaryen Madness", given to the extremely deranged members of the house, caused by members of the family traditionally inbreeding with their close relatives, especially siblings, to keep the Targaryen bloodline pure. Under these insane family members as kings, House Targaryen has acted as a villainous faction at times due to the catastrophic events caused by the more mentally unstable monarchs in the dynasty.
Known mad Targaryens
King Maegor the Cruel was perhaps the first mad Targaryen in Westros history. He usurped the throne from his nephew and promptly decapitated the one Grand Maester who protested. As king, Maegor turned to brutal tactics to suppress the Faith of the Seven, even riding on his dragon Balerion to burn down a Sept with all worshipers inside, using archers to pick off stragglers. He was found dead seated on the Iron Throne, his wrists slashed by the blades.
King Baelor the Blessed was overzealously obsessed with religion and purity, to the point that he starved himself into an early grave because he believed that food is of this world, and the material world is sinful. However, even with his madness, Baelor himself was neither a corrupt king nor a tyrant, making him by far the most pious of all the Targaryen kings. According to history, he starved himself to death, by the prolonged fasting to cleanse himself of lust, but some believe he was poisoned by his Hand and uncle, Viserys.
Prince Rhaegel, older brother of King Maekar, was meek, mad, and sickly. He had massive delusions and was known to randomly take off his clothes and dance naked through the halls of the Red Keep. However he was described as kind and gentle. He died whilst choking on a lamprey pie.
Prince Aerion Brightflame, son of King Maekar and nephew of the also-mad Prince Rhaegel. Aerion killed himself by drinking wildfire, believing it would turn him into a dragon, instead he died screaming. A year later, after the death of his father, Aerion's infant son Prince Maegor was passed over by a Great Council in favor of Maekar's youngest son Aegon, partially out of fear that Maegor had inherited his father's madness.
King Aerys the Mad, nephew of Aerion. The infamous Mad King and arguably the infamous monarch in the Targaryen dynasty overall. In his youth, Aerys was charismatic and ambitious with the desire to become the greatest king in history, until he slowly turned into a perverted, paranoid man, do to both jealousy of his Hand Lord Tywin Lannister and trauma from that his wife Rhaella gave so many miscarriges and lost so many potential heirs. He had violent visual and auditory hallucinations, as well as a near permanent feeling of persecution and jealousy, which drove him to execute anyone who slighted him out of fear that they were conspiring against him. He eventually attempted to blow up King's Landing with jars of wildfire, believing he would rise from the ashes as a dragon... and it eventually killed him. Betrayed and slain by his own Kingsguard, Ser Jaime Lannister the Kingslayer. The death of Aerys marked the end of the original Targaryen reign of the Seven Kingdoms, which lasted for nearly three hundred years after Aegon's Conquest.
Viserys, the Beggar King, second son of Aerys II, suffered from child trauma and grown into a broken bitter boy in denial. As young he was nice and caring to his sister, Daenerys, until they had to beg and sell their memories for survival. He had delusions of greatness and would have frequent, violent outbursts of jealous anger towards Daenerys. Died as an exile in Essos, at the Dothraki Sea, after being "crowned" with melted gold on his head by Khal Drogo.
Queen Daenerys Stormborn, the Mother of Dragons, the Khaleesi of the Great Grass Sea, the Unburnt and the Breaker of Chains, as well as the youngest child of Aerys II, had been longing to take back the Seven Kingdoms for her dynasty ever since she was exiled with her older brother, Viserys. Although she had abolished slavery in Essos and sought to become a well-intentioned ruler for Westeros, she could not escape from her father's legacy in the TV show. After suffering from the loss of her closest friend Ser Jorah Mormont and witnessing the deaths of Missandei, Rhaegal and Viserion at the hands of her enemies, she completely sacks King's Landing with Drogon and the rest of her army in a blind rage as soon as the city surrenders, killing thousands of innocent people and turning King's Landing into a burning ruin.
All the same, his descendants continued to threaten the Targaryens until half a century later, when Barristan the Bold slew Maelys the Monstrous on the Stepstones, extinguishing Daemon's line.
~ Varys, referring to the Blackfyre rebellions after Daemon Blackfyre's death
Members from the infamous House Blackfyre, which originated from Daemon Blackfyre, a bastard of Aegon IV Targaryen, were possibly affected by the madness with Targaryen blood, so that they rebelled five times to ursurp the Iron Throne. Maelys Blackfyre, known as "Maelys the Monstruous", who is the last Blackfyre ursurper, was also described as an extreme and unpleasant savage.
Aerys II Targaryen, the Mad King
Daenerys succumbs to the Targaryen madness she had long sought to escape during the Battle of King's Landing.
Even though House Targaryen was filled with madness, savage and disgrace it brought, this does not mean that all Targaryens were as a rule mentally unstable, as seen with how Daenerys Targaryen is still mostly mentally stable while her own brother Viserys is highly disturbed. However, Daenerys can show signs of madness by killing horribly people who angered her, especially during her frustrating rule as Queen of Meereen, where she allows the Shavepate to torture rich families for being suspects of treason and abandons Meereen and Astapor to chaos and death, while thinking only of Daario Naharis's body, her TV series counterpart is a bit more reasonable as less violent though. Daenerys's oldest brother Rhaegar was considered a great man by all who knew him, though him escaping with Lyanna Stark can be considered a scandalous action that only caused a war and the death of Rhaegar's family. Maester Aemon became a wise and revered advisor to the Night's Watch for many decades, until everyone forgot his true identity as a Targaryen. The cunning manipulating Targaryen bastard known as Brynden Rivers, or Lord Bloodraven (three-eyed crow or three-eyed raven), disappeared shortly after bringing Aemon to the Wall.
Daenerys is not thought to be insane, though her merciless treatment of slave masters in Meereen is a dangerous hint that she may not have escaped from the Targaryen madness. Even so, her actions were ultimately against a group who were mistreating others (seeing this as an echo of how she was mistreated), and she thought she was helping to secure freedom for the slaves of the region. She's trying to learn how to rule, yet she's failing at every step also due to her quick temper and easy lust for the manipulating and dangerous Daario.
However, Barristan Selmy notes that the Mad King also genuinely believed his actions were just, even though others knew he was a madman, which compels Daenerys to become more merciful.
She also became known by most cultures in Essos as 'the Mad King's Daughter', due to her destroying the economy and trying to destroy an ancient culture and replacing with her own one.
Her behavior is not unlike her father. In his youth, Aerys was ambitious, charismatic and gentle, but was often vulnerable to manipulation and schemes, which soon led to his imprisonment during the Defience of Duskendale. Later Aerys became paranoid, fearful and ruthless. Both Aerys and Daenerys "Targaryen madness" was triggered by psychological trauma.