Macbeth was born in the year 1005, as the son of Findlaech, High Steward of Moray, by Doada, a daughter of Maol Chalvim II of Scotland. This made him of royal birth, with connections to the throne strong enough to disturb his cousin, Prince Duncan. In 1020, Duncan decided to remedy this by sending Gillecomgain the Hunter to Castle Moray to assassinate both Findlaech and Macbeth.
However, Macbeth had been recently brought to the Weird Sisters' attention by the Archmage, with instructions to watch over both him and Demona. The Sisters thereby arranged for Demona to come to Castle Moray and save Macbeth's life from Gillecomgain, although Findlaech was slain, thus beginning their alliance. Duncan awarded the title of High Steward of Moray to Gillecomgain, dispossessing Macbeth (who, without his father's patronage, no longer seemed a threat to him).
In 1032, Duncan, having decided that Macbeth was still a threat to his claim to the throne (and that of his new-born son Canmore) ordered Gillecomgain to assassinate Macbeth as well. When Gillecomgain refused, Duncan told Macbeth that Gillecomgain was Findlaech's murderer, which motivated Macbeth to move against Gillecomgain at once. (It helped also that Gillecomgain had taken to wife Macbeth's love, Gruoch, against her will). The Weird Sisters arranged for Macbeth and Demona to fight against Gillecomgain together and defeat him. After Gillecomgain's death, Macbeth became High Steward of Moray and married Gruoch. He also became father to Gruoch's son Luach, although it remains uncertain as to whether Luach's biological father was Gillecomgain or Macbeth.
In 1040, the Sisters intervened in Macbeth's life again, prophesying before Duncan that Macbeth would someday become King of Scotland. Duncan, his suspicions reawakened, moved against Macbeth at once. Macbeth's own forces were outnumbered, and so in desperation, he sought help from Demona, who was herself being attacked by Duncan and his followers. Demona was initially reluctant to remain Macbeth's ally, until the Weird Sisters stepped in and offered to rejuvenate Demona if she would accede. They transferred Macbeth's youth to her, with his consent, and in the process, magically bound the two of them together for the rest of their lives. With the aid of Demona's Clan, Macbeth overthrew and slew Duncan in battle, and was crowned High King of Scotland. He promptly made peace with the gargoyles, and appointed Demona his primary advisor.
King Macbeth declares a golden age between humans and gargoyles.
For seventeen years, Macbeth ruled Scotland in peace, and both humans and gargoyles thrived under him. But in 1057, Duncan's son Canmore made common cause with the English, and invaded Scotland to regain his father's throne. When Macbeth's father-in-law Bodhe urged Macbeth to cast off his alliance with Demona in order to remove the English's supposed reason for invading Scotland, Macbeth listened patiently; when Luach protested his father's willingness to hear Bodhe's words, Macbeth replied that "A wise king considers his options, and then decides." Unfortunately, Demona, eavesdropping, interpreted Macbeth's response as a sign that he was planning to betray her, and so deserted him in anger. Thanks to the desertion of Demona and her clan, Canmore was able to easily sack Castle Moray. When Macbeth and Gruoch escaped the castle, Canmore and Demona both confronted them; while Macbeth angrily berated Demona for betraying him, Canmore stabbed him in the back. Both Macbeth and Demona were temporarily slain, and Gruoch, Luach, and Bodhe all believed Macbeth to be genuinely dead. Bodhe declared Luach the new King of Scotland, and the two men left to continue the war against Canmore, leaving Gruoch alone with her husband.
The Weird Sisters awakened Macbeth and Demona, and told them the terms of their link to each other, revealing that they were now immortal unless and until one slew the other. Macbeth wished to continue the fight against Canmore, but Gruoch persuaded him that his return from the dead would appear to verify Canmore's accusations that Macbeth was involved in sorcery, and urged him to leave Scotland, for Luach's sake. Macbeth sadly parted from her, never to meet her again, and began the life of a lonely wanderer.
Over the centuries he pursued Demona, first to gain revenge upon her, but increasingly to find release for himself from his unwanted immortality. Macbeth has grown weary of his long life, and he knows that the only way for it to end is for he to slay Demona - or she to slay him. They have encountered each other many times over the centuries, but never managed to bring their feud as yet to a definite close.
Around 1606, Macbeth's life-story became the subject, in a highly distorted form, of William Shakespeare's tragedy Macbeth, which has since become regarded as one of his greatest plays. Macbeth, who knew Shakespeare well - though did not reveal his true identity to him - was amused rather than offended by the play.
By the 1990s, Macbeth had taken on the alias of Lennox Macduff, a medieval scholar. When he learned about Goliath and his clan, he came to New York and offered to remove them from Castle Wyvern for Xanatos; his hope was that Demona would come to their rescue and give him the opportunity for a final encounter. He was disappointed to discover from Goliath that Demona had become the clan's enemy and was uninterested in rescuing them; in the battle with Goliath, Macbeth's New York mansion was burned down, but Macbeth escaped.
Not long afterwards, Macbeth stole the Scrolls of Merlin when they were brought to New York, presumably hoping to use their magic against Demona. When he discovered that they contained Merlin's memoirs rather than his magical secrets, however, he let the gargoyles take them back.
Macbeth finally had his longed-for encounter with Demona not long afterwards, when she placed her "stone by night" curse upon New York. Before the two of them could fight each other to the death, however, the Weird Sisters intervened, persuading the two (with some help from Goliath) not to slay each other.
Afterwards, the Sisters whisked Macbeth and Demona away, placing them under their control and having them steal the Grimorum Arcanorum, Eye of Odin, and Phoenix Gate from the clock tower, so that they could give these to the Archmage.
Keeping Demona and Macbeth under their control, the Sisters made them attack the gargoyles upon Avalon, but King Arthur defeated Macbeth in single combat. Goliath forced the Weird Sisters to release Demona and Macbeth from their control afterwards, and then sent them away from Avalon. Avalon sent them both to Paris, where Demona and Thailog together tricked Macbeth, under the alias Lennox Macbeth into marrying Demona in her human form as Dominique Destine. They had different motives for this; Demona hoped to gain Macbeth's fortune and add it to her own, while Thailog hoped to trick Demona and Macbeth into killing each other so that he could gain all their wealth. However, Goliath and his companions thwarted this scheme when Avalon sent them to Paris.
Macbeth returned to New York afterwards, where he soon learned about King Arthur's quest for Excalibur, and decided to claim the magic sword for himself. In the end, however, it was Arthur who recovered Excalibur. The Once and Future King held no grudge against Macbeth, however, and offered to take him into his service. Macbeth was too independent to become one of Arthur's followers, but was willing to act as his ally instead.
When the gargoyles were revealed to the world, Macbeth appeared on Nightwatch in his Lennox Macduff role, and supported the clan, urging the humans of New York to make peace with the gargoyles and debating vehemently against Margot Yale, who wanted them locked up.
