Our knowledge of the dynasties of the Pharaoh’s derives in the first place from Manetho, a Greek working for the Ptolemies. Actually that well-worn statement is misleading; Manetho is lost, and our knowledge of the contents of his work derives from quotations by Eusebius, mostly in the Chronicle.
In the 19th century Drovetti discovered a papyrus roll, dated to the 12th century BC, containing a list of kings so far. This he sold to the Italians, and in the process of being passed around the nearly complete roll was reduced to a heap of fragments.
From this article I understand that some mislaid fragments have been located, and that the British Museum will be trying to piece them into the remains.