On January 5, 1649, during the English Civil War, the Rump Parliament created a High Court to try King Charles I for treason. His trial led to his execution on January 30, marking the only time in history the British monarchy was abolished, replaced by the Commonwealth under Oliver Cromwell.
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https://nymag.com/intelligencer/2017/02/what-it-means-that-bannon-sees-himself-as-thomas-cromwell.html
https://www.youtube.com/watch?v=dBPf6P332uM