Talamyr is one of the Great Merchant Houses of Karnathas (more commonly just the "Great Houses"). They are, as the name implies, three merchant houses headquartered in southern Karnathas. They are not the only merchant interests in the city-states but they are the largest and most powerful. They also have holdings and agents in other cities around the known world.
The smallest of the three Great Houses, Talamyr is a relatively new house, having risen to prominence shortly after the Thaumaturgical Wars. Though it does not have the abhorrent reputation of House Malor, it is a very insular house and little is known of the private lives or dealings of its members. This has made people somewhat suspicious of Talamyr despite its impeccable honesty when it comes to trade.
House Talamyr's wealth, upon which its dominance is based, comes from the fact that they trade in exotic items that cannot be acquired elsewhere. How they get these items is unknown but their cost is quite high (it is rumored that payment for certain select goods goes beyond mere coin). Talamyr engages in more mundane mercantilism as well, but this ability to acquire the extremely rare or exotic is what they are best known for.