Stormhome & Eberron
From the Eberron Campaign Guide (sorry about that copyright thing, WotC):
Until House Lyrandar secured rights to this island at the mouth of Scion’s Sound, Stormhome was a rugged and desolate place; a windswept rock home only to a garrison of demoralized soldiers. Six hundred years ago, Lyrandar chose this spot to build its enclave and used weather-controlling magic to divert the worst storms away from the island. The results were astonishing: Stormhome became an island paradise, a testament to House Lyrander’s wealth and power. Stormhome remains part of Aundair but is left to its own devices, making it an ideal retreat for foreign dignitaries and nobles. Even Queen Aurala seems enchanted with the place, spending a portion of each year in the company of Lyrandar’s baron, Esravash d’Lyrandar, swapping secrets and rumors to the dismay of both their advisors. As the premier destination for the wealthy and powerful, Stormhome has emerged as a hotbed of intrigue, and agents come to broker alliances and gather intelligence about their rivals.
Stormhome is also seen by the other Houses as a visible sign of Lyrandar’s arrogance and even recklessness. Though of course all the Houses’ main enclaves are both lavish and manifestations of the Houses’ power, the existence of Stormhome as an essentially independent fiefdom is a clearer violation of the Korth Edicts – the ancient laws of the last empire that still govern the existence of the Houses – than any other House.