“ Alchemical Gold - popular in the weapons of the nobility, this allows for gold to be used in their swords and lances without the fear of the metal bending, deforming or otherwise breaking in combat.”
“ Your Pillow> This magic pillow is "+2" comfort and remains cool despite the temperature. It also shrinks to the size of a cigarette box for easy transportation. These are WILDLY popular wth those who have to travel(especially adventurers) . They command a huge price far outside it's true value , sometimes selling for thousands of gold pieces in a world where stating fighters are often equiped w +2 Swords. The method of creation is lost but sevral enterprising mages are trying to recreate this, with no success.”
“ Surnames: The Chinese were among the very first cultures to adopt the use of hereditary surnames (around 2800 BC). But the custom didn't quite catch on in Europe - at least not until the Venetian aristocracy made it popular sometime between the 10th and 11th centuries AD. What culture made it popular in your setting and why?”