According to the narrative presented in Geoffrey of Monmouth's Historia Regum Britanniae, King Ambrosius Aurelianus embarks on a quest to construct a memorial for the Celtic Britons who were treacherously slain by Anglo-Saxons.
When conventional methods fail to produce an awe-inspiring monument, Ambrosius turns to the renowned wizard Merlin for guidance.
This prompts Uther Pendragon to lead an expedition to Ireland, where a battle against the Irish king Gillomanius ensues, resulting in the successful retrieval of the stones with Merlin's magical assistance.
While the story itself is fictional, archaeological research by Mike Parker Pearson suggests intriguing connections between Stonehenge and the Waun Mawn stone circle in Wales, indicating the potential for a historical basis within the legendary narrative.
[4] Pearson's team of archaeologists found evidence suggesting that most of the Waun Mawn stone circle in the Preseli Hills was taken down and brought to Salisbury Plain, where it became the first phase of Stonehenge.