Hasphat Antabolis is an Imperial drillmaster with the Fighters Guild in Balmora. He thinks of himself as a scholar and as such is particularly interested in Dwemer ruins and artifacts. Hence he is also the author of Dwemer History and Culture which appears in both Oblivion and Skyrim.
Having lived in Morrowind all his life and having talked a lot to backcountry mercenaries, he knows a lot about the country and its natives. Also because of that, Antabolis is quite knowledgeable on the subject of the Nerevarine Cult, and is the author of the book, Life and Times of the Nerevarine.