This medal is also referred to as a pattern shilling due to its size and the historical context of its production. In 1628 Charles asked Parliament for money to increase the military and naval forces of the kingdom. After the 'Forced Loan' of 1626-27, used to finance the Duke of Buckingham's unsuccessful expedition to assist the Protestant stronghold of La Rochelle, Parliament was very hostile to the King. After much argument Parliament forced the king to accept the Petition of Right before granting him his subsidy.