Well, isn't today an update spam?
I want to mention this kid here because recently some info on him have been updated.
For the longest time he was listed as Nobunaga's fifth son and that his birth year was listed as 1569, making him only about 13 years old (or 14 according to Japanese age count) when he died. That was fine and all, except that he had one son before he died, and... that was a surprise.
I know samurai marry young, but still. His older brothers don't have children until they're 20-something.
Well, now the Wiki page is saying that Katsunaga is the fourth son and that he might have been born in 1565. The explanation given is that he was the fifth son only if you counted Nobumasa (the mysterious illegitimate child supposedly born in 1554 whose existence and/or relation to Nobunaga is still highly debatable).
The Shinchou-ko Ki's notes also mentioned the possibility of Katsunaga being the fourth son, but didn't say why. The actual text said that Katsunaga was the youngest son when Nobunaga and Takeda Shingen was trying to make peace, but that's not very much of an explanation.
Also. His name was apparently not Katsunaga anymore once he went back home to the Oda family (he was previously adopted/taken hostage by the Takeda). It was changed into "Nobufusa". But everyone still knows him better as "Katsunaga" because it's already so widespread that its hard to correct the mistake. Kind of like how Nobunaga's brother is better known as Nobuyuki even thought his name is actually Nobukatsu (hurray for confusion because Nobukatsu is a popular name!!!).
I love muddles of names. I really do. Buuuut, for simplicity's sake, I will just keep on calling him Katsunaga here.