A distinctive dome-shaped hill lying 4½ miles (7 km) east of Haddington in East Lothian. It is 221m (725 feet) in height. Geologically, Traprain Law is an igneous intrusion of Lower Carboniferous age (c. 335 million years ago), and is composed of phonolite. On the northeast side of the hill is a disused road-metal quarry.
A hoard of silver was found close to the hill in 1919. This is thought to have represented a payment from the Romans to their local allies the Votadini tribe, who had a settlement on the Law.
Nearby is the Loth Stone which stands 2.4m (8 feet) high and is thought to mark the grave of the mythical King Loth, after whom the Lothians were said to be named, although excavations have revealed no burials.