House Blackfyre

House Blackfyre is a cadet branch of House Targaryean in George RR Martins A Song of Ice and Fire and it's TV adaptation Game of Thrones. Though House Blackfyre never actually appears, having been long extinct by the time the story starts, their legacy still haunts Westeros.

Founding
In the dying days of King Aegon IV, his bastard son Daemon was legitimized was given permission to build a keep of his own on the Blackwater rush. However, this proved to be a mistake

The first Blackfyre Rebellion
In 196 AC, Daemon rebelled against the Iron Throne using the lie that hat Daeron was the son of Aemon the Dragonknight instead of King Aegon IV Targaryen and that the gift of the ancestral weapon Blackfyre proved that Aegon wanted Daemon to succeed him. However the Blackfyre rebellion ended at the Battle of Redgrass Field.

Both Daemon and his two eldest sons perished in the battle. Daemon's survivng sons fled to the Free Cities and went into hiding.

Second Blackfyre Rebellion
Daemon II Blackfyre, who had dragon dreams, infiltrated a Tourney planning to start a second rebellion. He defeated Ser Franklyn Frey and Ser Galtry the Green in the Whitewalls Tourney, which was where the Second Blackfyre Rebellion began in 211 AC. However, the rebellion was snuffed out quickly by Lord Bloodraven before it could spread beyond Whitewalls and several key Blackfyre supporters were killed.

Third Blackfyre Rebellion
In 219 AC, Bittersteel, a Blackfyre sympathizer and Knight of Westeros launched a new invasion after crowning Haegon Blackfyre. It was late in the reign of King Aerys I Targaryen, who was not very involved in ruling, but his younger brother Maekar's leadership during the conflict was commendable, as was the courage of his youngest son Aegon "Egg" Targaryen. Prince Aerion Targaryen was also active in its events. The war featured the second duel between Bittersteel and Bloodraven. At the end of the final battle Haegon I was dishonorably killed after he surrendered and had given up his sword. Bittersteel was taken captive and in chains to the Red Keep, yet while Brightflame and Bloodraven both urged that he be executed, Aerys I foolishly offered him mercy, sending him north to join the Night's Watch. The Golden Company learned of this through their informants and attacked the prisoner transport as it sailed to Eastwatch-by-the-Sea. Before the year was over, Bittersteel had returned to Tyrosh and crowned Haegon's eldest son as Daemon III Blackfyre.

Fourth Blackfyre Rebellion
In 236 AC, Daemon III Blackfyre led the Fourth Blackfyre Rebellion, landing at Massey's Hook. The rebellion had little support, however, as people thought the Blackfyres to be done, as tattered as their banners. At the Battle of Wendwater Bridge, Ser Duncan the Tall slew Daemon III Blackfyre. Bittersteel retreated across the narrow sea again, and the war was quickly over.

War of the Ninepenny Kings
30 years after the 4th Blackfyre rebellion, the Blackfyre's under the leadership of Maelys Blackfyre, once again gathered up enough strength in the Free Cities in the form of sellsword armies to mount another attempt to seize the Iron Throne. However, King Jaeharys II caught wind of the attack and sent an army to the stepstones to engage the rebels

The war ended when the young Ser Barristan Selmy killed Maelys the Monstrous in single combat, ending the war and the Blackfyre line.