Tyrion Lannister: The Dwarf by Pär Lagerkvist
Okay, this one is a bit of a give. Lagerkvist's 1945 novel tells the tale of a misanthropic dwarf who uses Machiavellian schemes to keep his ruler in power. The novel, which takes place in a Renaissance-era Italian city state, is told in the form of diary entries from the titular dwarf. Lagerkvist's character is more an embodiment of evil and hatred than Tyrion — at least outside of his drunken nihilism last season after murdering his own father — but something tells me Tyrion would relate to the dwarf's anger and ruthless manipulations.