The creation of the King's Oxford Parliament in January 1644 placed Oxford at the centre of the Cavalier cause and the city became the headquarters of the King's forces. (Wikipedia article)
The Siege of Oxford refers to the English Civil War military campaigns waged to besiege the Royalist controlled city of Oxford, involving three short engagements over twenty-five months, which ended with a Parliamentarian victory in June 1646. (Wikipedia article).
Below is a representative selection of varous denominations, but for a detailed look at the various dies for the threepence please click here.