She was the widow of Henry's brother, and the marriage required a Papal Bull (granted under pressure) to allow the marriage to take place at all. To then ask for an annulment.... well, that was a bit much for Rome.
Anyway ... one might speculate that Henry would not have married Catherine on his own; perhaps a male heir would have resulted from some different marriage, and the whole divorce thing might have been avoided.
Not a Bull, just a fairly standard dispensation. I doubt there was any real pressure required, either.
Queen Katherine went to her grave denying that her marriage to Prince Arthur was ever consummated, which (canonically speaking) rendered the dispensation moot.
After a little reading, it appears that the dispensation was granted twice, once in a letter and once in a formal Bull (unusual for something so routine). I don’t see much evidence of “pressure” being needed to grant the bull per se, but only to grant it before Queen Isabella died.
Well, it’s a bit doubtful isn’t it? Isn’t that what makes the story so compelling? HE was the one that was shooting blanks, but it was the women who got the axe. I realize it was more complicated than that and that he did have two sons, btw.