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In the 1930s this guy started claiming that he was the rightful king of England because he descended in the male-line from everyone's favorite male Tudor and his head-losing wife (well, one of them). However, the descent was tainted by the fact the son was a bastard, purportedly born before the marriage of Henry and Anne.
Maybe there are plans for a wedding, but the baby is born prematurely, and it is Henry's longed for son, but much like Fitzroy, he's a born and bred bastard. Then after the wedding, Elizabeth is born, and the rest of Anne's obstetrical history takes its OTL course.