Bathilda Bagshot (mid-1800s-1997) was a magical historian and author of A History of Magic, which was used in Hogwarts as textbook in History of Magic classes. She had scant and white hair, with her scalp clearly visible. Her eyes were “Thick with cataracts”, she was tiny, her head was at the level of 17-year-old Harry’s chest, and stooped.
Her great-nephew was Gellert Grindelwald.
Bathilda Bagshot was already living Godric’s Hollow as an adult when young Albus Dumbledore and his family arrived there. Kendra Dumbledore arrived in Godric’s Hollow with her children c. 1850, after the imprisonment of Albus Dumbledore’s father, Percival, for the murder of three young Muggles who had tormented Albus’s sister, Ariana, an event which occurred “scarcely a year” before Albus Dumbledore’s first year as a Hogwarts student. According to Rita Skeeter’s expose-like book, The Life and Times of Albus Dumbledore, Bathilda tried to befriend Kendra Dumbledore after they arrived, but she was rebuffed.
Nevertheless, Bathilda became good friends with young Albus Dumbledore, whom she perhaps had come to regard as a protégé, being impressed with a paper he wrote as a Hogwarts student for the scholarly journal, Transfiguration Today. Rita Skeeter learned of their close friendship and was so keen to have Bathilda as a source for her screed on Dumbledore, she admitted using Veritaserum on Bathilda to get the information she wanted. Bathilda’s care and concern for young Albus was such that, when she took in her great nephew Gellert Grindelwald after his expulsion from Durmstrang, Bathilda made a point of introducing rindewald to Albus, who she believed was “missing the company of lads his own age” .
Later in her life, Bathilda befriended James and Lily Potter, and “dropped in most days” to see the young family, regaling them with stories of Dumbledore’s youth. Bathilda was the only person to join James and Lily for Harry’s birthday tea when Harry turned one year old.
Bathilda was murdered by Lord Voldemort or Nagini sometime in the weeks before Christmas Eve, 1997. When Harry and Hermione visited Godric’s Hollow on Christmas Eve, 1997, and were accosted by who appeared to be Bathilda Bagshot, it was really Nagini inhabiting Bathilda’s dead body. Bathilda’s body was discovered several months later, shortly before the March, 1998 broadcast of the underground radio program "Potterwatch," which reported the discovery.