Geoffrey's composite Merlin is based primarily on Myrddin Wyllt, also called Merlinus Caledonensis, and Aurelius Ambrosius, a mostly fictionalised version of the historical war leader Ambrosius Aurelianus. The former had nothing to do with Arthur: in British poetry he was a bard driven mad after witnessing the horrors of war, who fled civilization to become a wild man of the wood in the 6th century. Geoffrey had this individual in mind when he wrote his earliest surviving work, the Prophetiae Merlini (Prophecies of Merlin), which he claimed were the actual words of the legendary madman.
Geoffrey's Prophetiae do not reveal much about Merlin's background. When he included the prophet in his next work, Historia Regum Britanniae, he supplemented the characterisation by attributing to him stories about Aurelius Ambrosius, taken from Nennius' Historia Brittonum. According to Nennius, Ambrosius was discovered when the British king Vortigern was trying to erect a tower. The tower always collapsed before completion, and his wise men told him the only solution was to sprinkle the foundation with the blood of a child born without a father. Ambrosius was rumoured to be such a child, but when brought before the king, he revealed the real reason for the tower's collapse: below the foundation was a lake containing two dragons who destroyed the tower by fighting. Geoffrey retells this story in Historia Regum Britanniæ with some embellishments, and gives the fatherless child the name of the prophetic bard, Merlin. He keeps this new figure separate from Aurelius Ambrosius, and to disguise his changing of Nennius, he simply states that Ambrosius was another name for Merlin. He goes on to add new episodes that tie Merlin into the story of King Arthur and his predecessors.
Geoffrey dealt with Merlin again in his third work, Vita Merlini. He based the Vita on stories of the original 6th-century Myrddin. Though set long after his time frame for the life of "Merlin Ambrosius", he tries to assert the characters are the same with references to King Arthur and his death as told in the Historia Regum Britanniae.
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