This notebook was owned by Harry Potter from at least 1997. It was used to keep his notes and other writings, such as things he wanted to remember. After Albus Dumbledore's and Harry's mission in the Horcrux cave in early 1997, in which they found what they thought to be a Horcrux that was owned by Regulus Black, Harry kept this notebook with him at all times, keeping it in his rucksack. At least two full pages were filled with notes on Horcruxes, what have already been destroyed, what needs to be destroyed and what could possibly be a Horcrux, and who is R.A.B., and whether this individual is male or female.