January 6, 1649 – The Rump Parliament appoints a High Court to try the King

The Rump Parliament was what remained of the British Parliament after Colonel Pride had purged it a month earlier, leaving only those parliamentarians who supported the army.

On January 6, 1649, the Parliament appointed a total of 135 men to constitute a High Court for the trial of King Charles I for tyranny. A quorum was declated to be twenty of these appointees.

The trial of Charles I commenced shortly thereafter, and duly returned the guilty verdict it was intended to.

Colonel Thomas Pride refusing admission to the Presbyterian members of the Long Parliament.
By UnknownThe Tudors and Stuarts, by M.B. Synge, Public Domain, Link

As mentioned in:

Oliver Cromwell — Monty Python