The Rillaton Barrow () is a Bronze Age round barrow in Cornwall, United Kingdom. The site is on the eastern flank of Bodmin Moor in the parish of Linkinhorne about four miles (6 km) north of Liskeard.
Rillaton Barrow was excavated in 1837 and found to contain a centrally-placed inhumation beneath the 34-metre wide barrow. The burial had been placed in a stone cist measuring 2 meters by almost 1 meter. Human remains were found along with grave goods including the Rillaton Gold Cup, a bronze dagger, beads, pottery, glass and other items.
Rillaton Gold Cup
Most notably, the burial contained the Rillaton Gold Cup, a biconical gold vessel, around 9 cm high, with a handle attached with rivets. The Rillaton Cup and the Pelynt Dagger are two artefacts that have been found in Cornwall that have been claimed to show contact with the Mycenaean world. However a 2006 study by Stuart Needham and others sees no reason to look so far afield for parallels, and locates them in a group with other "unstable" cups (round-bottomed and unable to stand up) in precious materials found in north-western Europe. They propose a date around 1700 BC for the Rillaton Cup, though it may have been buried a long time after it was made. In contrast, the Pelynt Dagger might actually be Mycenaean.
After their discovery in 1837 the finds were sent as Duchy Treasure trove to King William IV, and remained in the royal household.