Historical myths

I think myth #3 is highly unlikely. All contemporary evidence points to the fact that King Henry VIII was very fond of his illegitimate son Henry Fitzroy. He took a great deal of pride in him, creating him Duke of Richmond and proclaiming him Lord-Lieutenant of Ireland. He arranged a marriage for him with the daughter of the Duke of Norfolk. He was rumoured to have considered making him an heir to the throne, though this would have been illegal due to his illegitimate birth. (Though governments, then as now, do tend to do whatever they want to, and change the law to suit their needs). Henry's political, religious, and personal inclinations were all concentrated upon producing a legal, legitimate male heir to the throne. Whatever plans he had for his natural son came to naught when the young Duke of Richmond died of tuberculosis at the age of 17. Henry's legitimate heir, from his third marriage (Prince Edward) wasn't born until the year following Henry Fitzroy's death. Henry VIII had experienced the disappointment of numerous miscarriages from his first 2 wives as well as 2 surviving daughters but no sons. It seems very unlikely that he'd plan the elimination of his illegitimate son in order to secure the succession for a hypothetical legitimate son who, at that time, didn't yet exist. There was no need to do such a thing as the succession would anyway have automatically gone to the legitimate son.