the 'purging' or 'cleansing' of emotions, particularly through pity and fear, that the audience experiences at the end of a tragedy.
Results in renewal and restorations.
Macbeth's self-destructive actions climax in Act 5 - Leads the audience to pity Macbeth - and so experience catharsis when he dies
Different Sources:
Original:
Macbeth was a good king for 10 years
Changes Macbeth to cruel and tyrannical, using violence and terror to make up for his unjust way he ascended to the throne. He declares "blood will have blood" - cycle of violence he initiated
Changed for dramatic purpose - more interesting plotline
Alternatively, support in Divine Right of Kings.
Different Sources:
Original
Holinshed's Chronicles the weird sisters were called the 'goddesses of destine'
changed to just three simple witches - limiting their power, and increasing Macbeth's choice and agency, making him responsible for his actions
Jacobean era were intensely religious and witchcraft was sinful. Witch hunts were a know and practised activity. King James was also interested in the topic, even writing a book called 'Daemonologie'.
By reducing witches power, Shakespeare delegitimises their power, perhaps to appeal to audience and monarch
Different Sources:
Original
Banquo is a partner with Macbeth to kill King Duncan.
In Shakespeare's version, Banquo is not an accomplice to the murder and is an honourable
Flatter King James I as he was a patron. - trace his lineage to Banquo.
Context - Divine right of kings
James was ordained by God - he had a supernatural duty to complete witch-hunts.
When he sailed to get his betrothed, Anne of Denmark, he was attacked by deadly weather, he thought it was witchcraft, so launched a large scale witch-hunt and published Daemonologie.
Evidence "Though his bark cannot be lost/Yet it shall be tempest-tossed
James was also misogynistic, living in patriarchal times. Evidence in Daemonologie. They were the weaker sex and so easily trapped by the devil. He thought this because of Adam and Eve.
Context - purpose of witches
warning against witchcraft, evil and bloodshed, whilst setting the pace for the play
parallels between the witches and the three Fates in Greek mythology.
Hecate was the goddess of witchcraft in Greek mythology
Witchcraft is high treason against God, and they influence Macbeth to go against God.