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Six stones erected by Merlin across Britain. Each had a series of prophecies written on it.

1. Located in Lyonesse.
2. Cornwall | Tristan and Lancelot battled.
3. Logres | The sword drawn by Galahad at the beginning of the Grail Quest was fixed in this stone.
4. In the Perilous Valley.
5. In the Dark Valley | Tristan and Lancelot’s second fight.
6. North Wales | Tristan and Lancelot had a third combat here.

One of these latter stones appears in an Italian cantare as the Rock of Merlin.

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Sources
Prose Tristan | 1230-1240
La Tavola Ritonda | 1325–1350