An excerpt from the writing of Samwell Tarly, a maester of the Citadel.
After the Second Battle for the Dawn ended and the Others were driven back, and both Jon, who was Aemon, and Daenerys were killed, their son Eddard became the Lord of the Seven Kingdoms. But he was but a babe then and regency needed to rule im his stead. And the head of regency was his Hand of the King, Aegon Blackfyre, whom they called Aegon the False, for he claimed to have been son of Rhaegar Targaryen and it was proven to be a lie. However, the dragon Rhaegal accepted him as his rider, because, black or red, he still was the blood of the dragon.
Rhaegal, remaining the only dragon in the world, had only one master, Aegon and he was Aegon's most powerful weapon that he used to punish all his enemies. And punished them he did. Aegon had an irrational and intense hatred of both Jews and Christians. He accused them of burning King's Landing instead of Daenerys and had all Jewish and Christian representatives in the city brought before the Iron Throne. Aegon sat upon it and demanded from every priest, Pharisee, rabbi, bishop and official to kneel and swear an oath to the Iron Throne. He demanded them to swear that they will always serve the Iron Throne, that they will obey the king as if he were a god, and, in king's stead, that they would obey him too.
In return, he promised them: "You can worship your shepperd god if you wish, but let him know that you belong to the Iron Throne and Westeros first and foremost."
This was not something Jewish and Christian representatives could compromise on. Almost all of them refused and were met with a bitter end. If they were lucky, Aegon would have had them beheaded. Those who angered him the most would be given to Rhaegal to feast on them.
And so, the first persecution of Jews and Christians in history began and Aegon became the first ruler to proclaim them as enemies of the realm. He even insisted on excluding the Jews from the title "King of the Andals, and the Rhoynar, and the Jews and the First Men" and crossed the Jewish name whenever it came upon documents in such a title. He planned to unite the region of Judea to either the Stormlands or the Crownlands and be done with both of his enemies in one hit.
But Jews were a proud people, just as proud and stubborn as the Dornish and they would not be so easily cowered. They fought for thousands of years against the hostile people of Westeros. If their history is to be believed, their forefathers and foremothers defeated legions and legions of Valyrians dragons when they crossed the Narrow Sea. And Aegon had only one dragon.
The first rebellion began in 304 AC, when a group of septons started mocking the Jews in front of a synagogue in Aegon's Town. Mockery grew into open humiliation and the Jewish rabbis warned the septons that they will not take insult in front of their own house and demanded the septons to leave. The Faith Millitant who were following the septons responded by slaughtering seventy three Jews on that day, among them five rabbis and a priest who came from Jerusalem in a visit.
Zealots could not stand this. Led by their brave leader, Simon bar Giora, they attacked the Faith Millitant next day and won the battle, killing those same septons and sending their bodies to Aegon in King's Landing. Aegon more than happily took the opportunity. He even said: "Thank you, Simon. Wihout this, I would have had no reason to wipe you from the face of the Earth."
Aegon mounted Rhaegal and, with an army of ten thousand men, marched to Judea. What happened was rather unpleasant to say the least. As it turned out, Jewish warriors were not terribly impressed by neither Rhaegal nor Aegon, and Aegon spent two years fighting in Judea. Simon bar Giora was a clever strategist, cunning warrior and inspiring leader. But he was no Rhaegar.
After two years of courageous resistance, the army of rebels was driven back and all the Jewish peasantry cowered before Aegon's forces. Some rebels tried to run towards the mount of Masada, but they were quickly found by Aegon's forces. New Jewish officials, including the High Priest, were ordered by Aegon to curse the army of rebels and to proclaim loyalty to house Targaryen. They did so. At least, Aegon was merciful enough not to demand them to bow before the Iron Throne again. Had he done that, who knows what would have happened.
Aegon brought the defeated rebel army to King's Landing, parading with them through the city. All the citizens rejpiced at the defeat of rebels they probably haven't even heard of until they entered the city gates. It must have been a very boring day for them. Simon bar Giora himself was following Aegon himself before the very Iron Throne. There, Aegon mocked him, offering him to sit on the Iron Throne, since he was king, wasn't he? Aegon even placed a crown on Simon's head, calling him "your grace" and "my lord" with laughter. When he was done, he was surprisingly merciful: he didn't give him over to Rhaegal. Instead he pushed him from the windows of the Tower of the Hand, and there Simon bar Giora met his end.
This victory angered made Aegon seem like a great warrior to all of Westeros. All the lord and ladies realized what would happen if they were tobrise againt the Dragon of King:s Landing. And let's just say that they were also not lining up to become the new Paramounts of Judea.
But this victory made Aegon go too far. He was tired of being the Hand of the King. With a bit of cunningness, a bit of money and a bit of luck, he placed little Eddard into custody, gained thevloyalty of the Small Council, made the Kingsguard swear loyalty to him and in that hour he walked over to the Iron Throne, Rhaegal present in the room and placed a crown on his own head, proclaiming himself Aegon of house Targaryen, Sixth of his name, Lord of the Seven Kingdoms, and King of the Andals, and the Rhoynar and the First Men. But not the Jews.
"I want to hear it from them." he said.