You do a really good job of researching your historical facts with what sources are to hand, so I was wondering how and from what source you were able to determine the ages of the brothers Lodbrok. While their deaths seem fixed with some reasonable degree of accuracy, the only indication I have of the age of either brother is an unsourced wiki claim that Ivar was born in 794 (which seems highly dubious for a man on active and constant campaign in the 860s-70s). Based on what you’ve said throughout the first three books (that Ivar’s son is old enough to be Uhtred’s father) and your description of Ubba as going gray where previously he was white, I’m assuming that Ivar was in his late forties to early fifties when he died, and Ubba about the same, with Ivar Ivarrson likewise in his forties. Is that the right idea? How did you ultimately estimate this, and what sources did you use? I’d really love to know.
Steven