Used as in 'Officer of the Green Cloth'; a department of the royal household, dealing with financial and legal matters, overseen by a lord steward. Essentially the department dealt with all matters related to below stairs. It was so named for the green cloth on the table around which its meetings were held. The steward's post was well worth having: remuneration was £100 a year plus 16 dishes with every meal. It was held by a succession of powerful earls and dukes. The board of the Green Cloth persisted into the 19c, as a branch of the lord steward's department. Today it still meets in Buckingham Palace.
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.