Updated OP with cultural analogues.
A great house is the central driving force of the game, and as such it is important to design them and to a lesser extent their major vassals—basically the dukes who control the major holds of the Kingdom. A player creating a major house is allowed to leave their vassals vague, but it isn’t entirely recommended. The following is a map detailing which provinces are duchies and which hosts the King’s capital to better help with said creation.
http://i.imgur.com/s1UwDQ8.pngAbout the Map - Seats of Kings of Orlandis are designated with a "K", the numerical code on the map designates the seat of power of a Duke (a high lordship in Game of Thrones). The information about these seats are up to the players.
NOTE: I can move any "K" on the map to fit your description or terms if you want, it doesn't take me much work to modify!
Ancestral WeaponsNorthern Orlandis (The Northlands)Runesteel is the product of an ancient metalworking progress from the Vyntic northmen. It is said to be as enduring and long-lasting as Mythril, but heavier. Produced from iron, tin, and other minerals in a forging process.
Runestone predates metal, allowing sturdy stone weapons to beat copper and weaker metals. Produced from.... rocks.
Central & Southwestern Orlandis (Lowlands, Midlands, Hinterlands, Highlands)Mythril is produced from a highlands/hinterlands mineral; mythril is the strongest metal in Orlandis, but the most difficult and rare. It has been seen as a "metal made for kings and myths". It is lighter and sharper than steel. Produced from mythrite and tin.
Silversteel is now seen as
sacred due to the scripture of the Word of Aavaar is now less revered than in ancient times. Mostly monastic orders and holy knighthoods are allowed the use of silver for silversteel, silver coins, or any material made of the metal. Produced from silverite, iron, and tin.
Southeastern Orlandis (Expanse & Verge)Voltaani Steel is the product of the exotic process of metal forging from Old Voltaani; knowledge is spread within the confederacy and the royal family known as House Antar. Said to be comparable to Mythril but easier to make and from generic steel processing and Endosi "magic".