James I was the patron of Shakespeare's company, the King's Men, and it is for this reason that many believe the play was written for him.
Central themes in Macbeth were tailored to fit King James I's interest; treason, regicide, the supernatural & the characteristics of power.
James I was a staunch believer in the Divine Rights of Kings & the Great Chain of Being.
The Divine Rights of Kings
This belief asserts that a monarch derived their authority from God & thus any attempt to depose or murder the king is an attempt on God Himself.
In the Jacobean era, TDROK was an accepted aspect of monarchy, therefore it's reflected in Shakespeare's writing.
Because King James I was the patron of Shakespeare's company, Shakespeare's portrayal of Duncan's murder as an act against God was intended to please his king & his patron.
The Great Chain of Being
TGCOB was the belief that God created the world with a clear hierachical structure encompassing all matter & life.
In the Jacobean era, people on the whole were much more religious that we are today & they would have considered TGCOB to be a fact of life rather than a religious belief.
Daemonologie
A book published by King James I - it explores James I's belief in witchcraft + magic and aims to dictate the punishment that should be given for practising them.
Daemonologie is a didactic text intended to prevent readers from engaging in witchcraft.
Shakespeare's depiction of the witches seems to hit most of James's expectations which may be a deliberate attempt to appeal to the King.
The Patriarchy
A social system in which men hold the power & women face oppression from these men in power. TGCOB dictates that men are superior to women, leading to a patriarchal social structure.
In the play, Lady Macbeth is consistently subverting patriarchal expectations of women.