In Book 3 Telemachus is schooled in the ancient Greek social contract between hosts and their houseguests. The concept, called "xenia", is simple: the host should offer the houseguest anything he wants, and the houseguest should not abuse this generosity, for he might find himself playing the part of host in the future. Nestor, the king of Pylos, exemplifies this social contract. Furthermore, Nestor's storytelling allows Homer to relate myths that fall outside of the "Odyssey"'s purview. He reflects on the Trojan War, praising Odysseus for his cunning. Telemachus begins to learn and appreciate what kind of man his father was. The story Nestor tells of Orestes in particular serves as a model for Telemachus to emulate: just as Orestes killed the overbearing suitor who occupied his father Agamemnon's estate, so should Telemachus kill the suitors and reclaim his own father's estate.