Philippa of Lancaster was the youngest daughter of Henry IV, who was married to Erik of Pomerania, heir to the Kalmar Union in 1406, when she was twelve years old. Until her death in 1430, she bore no children (although some sources list a stillborn child rather late in life). Philippa is rather well-regarded in the histories of her husband’s realms (certainly better than her husband), and served as regent during her spouse’s absence. Erik was later deposed (in 1439) and his nephew, Christoph of Pfalz-Neumarkt succeeded him as king of the Scandinavian realms, but likewise had no children. So what if Philippa had given her husband children? (I’ve never read that she was ‘damaged’ by a pregnancy gone wrong – although admittedly English-language histories on her are few (if any), so I could be wrong). Especially if their kids take more after Philippa than Erik. Would the deposition of 1439 still occur? Or would the estates(?) be willing to tolerate Erik knowing that he has a son and heir who’s slightly more politically adroit? Could the Kalmar Union hold (longer than it did OTL)?