These sturdy steel trivets are hand forged by Cracked Anvil Forge in Brisbane, Australia. They have a rust resistant blued finish and a light dressing of oil.
Trivets are stands for a wood or charcoal fire which hold pots and pans above the heat. A trivet stabilises round bottom pots and allows the fire to be tended without moving pots off the heat.
Based on an example from Museum of London (pg 153 of MOL Household Accessories)
1100 - 1200 AD, 1200 - 1300 AD, 1300 - 1400 AD, 1400 - 1500 AD, 1500 - 1600 AD