11 September – the Levellers' largest petition, "To The Right Honourable The Commons Of England", is presented to the Long Parliament after amassing signatories including about a third of all Londoners (including women).[4]
7–18 November – the New Model Army's General Council, convening at St Albans Abbey, debates and adopts the "Remonstrance of General Fairfax and the Council of Officers", largely drawn up by Henry Ireton, proclaiming the sovereignty of the people and calling for a trial of the King. On 20 November, a delegation of officers present the Remonstrance to Parliament.[1]
5 December – majority of the House of Commons votes in favour of accepting the Treaty of Newport.
6 December – Pride's Purge: Troops of the New Model Army under the command of Colonel Thomas Pride (and under the orders of General Ireton) arrest or exclude Presbyterian members of the Long Parliament who are not supporters of the Army's Grandees or Independents, creating the Rump Parliament[3] which on 13 December annuls the Treaty of Newport.
7 December – Cromwell returns to London having taken the surrender of Pontefract Castle.[1]
19–22 December – the King, under arrest, is moved from Hurst Castle to Windsor.