Standing over 700 feet tall and comprising the same geology as North Berwick Law - hard red basalt formed by volcanic activity - the site is similar to other locations in the area such as the Bass Rock in the Firth of Forth and Arthur's Seat in Edinburgh.
In 1919, a hoard of native and Roman silver of over 150 pieces was discovered at the dome-shaped Traprain Law (formerly Dunpender Law) to the east of Haddington, near Edinburgh. The 'Treasure of Traprain Law' contains a wide variety of coins and silver plate of varying origin; it is thought to reflect the thriving nature of trade between the natives of Dunpender and the Roman invaders.
The original triangular bowl is displayed at the National Museum of Scotland and was one of the very few whole objects found at Traprain Law. Most of the silver objects had been cut up as if ready for division between parties. It is generally thought the haul was loot brought back from the Continent and it is possible it represented payment to mercenary troops. Brook & Sons, Hamilton & Inches' predecessor at 87 George Street, were the silversmiths used to restore the haul and subsequently they made copies under license. Hamilton & Inches makes authentic replicas of the triangular bowls once again in their workshops found above their showroom.