Macbeth was a King of Scotland who ruled approximately "six hundred years" prior to William Shakespeare's native time in the early 17th century.
The Ninth Doctor saw him in the projection of Lulach's mind. After returning from war he thought that the Doctor had possessed Gruach. He wanted to fight him. He helped to defeat the Fuath. (AUDIO: The Curse of Lady Macbeth)
Macbeth died in battle on 15 August, 1057. A guide for time travellers suggested that King Macbeth may have been inspired by Carrionite prophecies. (PROSE: Time Traveller's Diary)
He later became best known as the titular character of Shakespeare's play Macbeth. Shakespeare based Macbeth on Holinshed's Chronicles of England, Scotland and Ireland, determining him to be the "perfect subject" for a play which was to be put before King James I after noting the witchcraft, regicide, beheading, as well as the chance for James' ancestor Banquo to be shown in a good light. (PROSE: The Empire of Glass)