Why was William Laud accused of high treason by Parliament?

William Laud, the archbishop of Canterbury from 1633 to 1645, was formally accused of high treason by Parliament in December 1640.1

His prosecution was driven by intense opposition to his religious and political policies, which had alienated many, particularly Puritans. Key factors contributing to his downfall included:12

• Religious Reforms: Laud enforced strict adherence to the Book of Common Prayer and introduced liturgical ceremonies that many perceived as moves toward "popery" or Catholicism.12
• Persecution of Dissidents: He used royal prerogative courts, such as the Star Chamber, to suppress Puritan preaching and punish critics through imprisonment and mutilation.1
• Political Influence: As a close adviser to King Charles I, Laud was associated with the King's controversial policies, including the attempt to impose Anglican forms of worship in Scotland, which triggered the Bishops' Wars.12

Following his arrest, his trial was managed by his critics, and Parliament eventually resorted to an ordinance of attainder to secure his execution, as they could not establish sufficient legal proof for treason. He was beheaded on January 10, 1645.1