A.N. — This very old lady is another case of her most important canon date not being open, so she gets shifted to the nearest empty spot. She should technically be the 24th, when Nagini uses her corpse. But let's deal with her alive, shall we?
357. Bathilda Bagshot
Most magical historians hadn't lived through the periods they covered in their works. Bathilda Bagshot had not only done so, but also personally known many of the central subjects of her books. Critics would contend that lent bias to her portrayals of Gellert Grindelwald and the Dumbledore family, but Bathilda would argue she provided insights nobody else could.
With A History of Magic, Bathilda laid out a chronicle of the previous hundred years of British magical development. It also served as a memento for herself. Bathilda's memory was failing, and paging through her tomes reminded her of what she'd witnessed.