Note : In this story Anne is born in 1507. Yeah and I changed Robb's age.
Henry was seething with anger, Anne had failed again to give him a son when she lost her child. He stared at her as she danced in the middle of the room with Sir Jamie Lannister, the brother of the visiting Queen. When Charles Brandon whispered those most damning lies about Anne, Henry believed he had a way out of his marriage. He would be able to finally wed his beloved Jane, but with King Robert and Queen Cersei still in England he knew he would have to wait for his revenge on the woman he now began to hate. His love died with their son, and with his injury his mind began to play tricks on him. An innocent conversation with George became treason in Henry's eyes. He would have Anne's head, no matter the cost to his soul.
"Cromwell, I want you to investigate the Queen about certain rumors."
"Yes your majesty." Cromwell stared at Henry in disbelief, he couldn't believe that Henry would actually find merit in the lies spewed by that traitor Brandon. He knew his findings would show the Queen had always been true to the King.
"And Cromwell I expect her guilt to be discovered." Henry took a gulp of his wine as he watched Cromwell leave the room not realizing that Jamie had overheard the King's intent to condemn his own wife. Jamie knew he would have to act quickly, for the royal court was set to begin their journey back to King's Landing in a few days time. He was to go hunting in the morning with the two Kings, he wasn't sure if he could convince King Henry that Anne's life was precious but he had killed a Mad King before for the good of the Kingdom.
As the hunting party set out, Cromwell stared out the window almost in tears. He loved his Queen, as all loyal subjects should and now he was being told to make sure she would die. He could see Queen Anne and Queen Cersei walk in the gardens, and he couldn't imagine two more unique Queens. Both intelligent women, who seemed to not fit in the world they were living. Cromwell's attention once more focused on the task at hand noticed that Henry wanted him to find evidence stating Anne had slept with her own brother. So it seemed the old favored family would soon be replaced by the Seymours. He sighed as he gathered his papers to walk down the hall towards Anne's apartments. Her ladies would be alone and able to answer all his questions, he didn't know how he would be able to twist their words into the lies Henry demanded.
Jamie watched Henry has he rode off in front of the others, he didn't know how he could kill the King of England in front of so many courtiers and King Robert without question. He sighed, he knew to save Anne, the only woman other than his own sister that made his heart jump, he had to do this task. Fate seemed to smile on him when he saw Henry veer off from the main group, Jamie charged after him. Jamie noticed that the river was close, he turned back to make sure nobody saw him as he pulled back the bow and let the arrow fly. With perfect precision it pierced Henry from the back pushing into his heart, as if Henry's death was being willed by a higher power. Henry gasped as the arrow hit, and tumbled off his horse. As Jamie walked toward Henry, he could see he was still breathing.
"Why..." the only word Henry could mouth.
"To save your Queen from your murderous rage, you bastard." Jamie leaned down and pulled the arrow from the King's chest and threw it into the river watching it float away. He could see the rest of the party was coming towards them, his quick thinking had him stage the King's death.
"Jamie, what has happened." Robert yelled out.
"King Henry fell from his horse, on his own arrow. It must have gotten stuck in the ground somehow." The arrow was covered in Henry's blood.
The news of the King's death quickly spread throughout London, and Elizabeth was proclaimed Queen. Anne was giving the title of Queen Regent, with so many still hating the Queen, Jamie chose to stay with her as her protector. He could see in Cersei's eyes the hatred she had for Anne. But Jamie new that he had fallen in love with her and this beautiful Queen broke Cersei's spell over him. Years passed and Jamie and Anne's relationship grew stronger, they eventually married in 1540. Mary was a threat to her daughter's crown but Anne also new of a much bigger threat, Cersei. Cersei had convinced her son, King Joffrey, that England, and it child Queen must be destroyed if he was to rule the Seven Kingdoms in peace. Jamie never told Anne that his nephew was actually his own son, that part of his life was shameful to him now that he had found real love. Anne was with child, and Jamie knew the only way for England to be save was to have powerful allies. Namely the Starks. Joffrey had murdered Ned Stark in front of his daughter and his son is now proclaiming to be the King of the North. Robb Stark was twenty years old, and he needed powerful allies. England had a strong army, and a daughter of Royal Blood who longed for love. Robb married the Lady Mary forming an much needed alliance. As the war raged on around them, the three English Queens were taken to the Tower for their protection. It was in the Tower that Anne gave birth to her son, Jamie. Months later Mary was delivered of a daughter, Katherine. It took over five years for the fighting to stop, in the end Joffrey was dead at the hands of his Queen's own grandmother and Cersei was still fighting for power. But with the loss of her son her world began to crumble, mere days after Joffrey's death Robb and Jamie's armies took King's Landing. Robb was crowned King, and his beloved Mary was reunited with her husband. The battle for the Seven Kingdoms was over for now. Robb and Mary had several more children including a son Eddard. Jamie and Anne lived peacefully in England watching as Elizabeth grew into a Queen to be reckoned with.
*** A/N - Dany doesn't exist in this meshing of worlds