Chislehurst its earlier format corresponded to the letters IMP (for "imperial"). The Chislehurst civil parish formed an urban district of Kent from 1894 to 1934. In 1934 it became part of the Chislehurst and Sidcup Urban District, which was split in 1965 between the London boroughs of Bromley and Bexley. The Walsingham family, including Christopher Marlowe's patron, Sir Thomas Walsingham and Queen Elizabeth I's spymaster, Francis Walsingham, had a home in Scadbury Park, now a nature reserve in which the ruins of the house can still be seen. A water tower used to straddle the road from Chislehurst to Bromley until
Francis Walsingham invasion of England along with a domestic uprising to liberate Mary, Queen of Scots, and depose Elizabeth. Throckmorton was executed in 1584 and Mendoza was expelled from England. After the assassination in mid-1584 of William the Silent, the leader of the Dutch revolt against Spain, English military intervention in the Low Countries was agreed in the Treaties of Nonsuch of 1585. The murder of William the Silent also reinforced fears for Queen Elizabeth's safety. Walsingham helped create the Bond of Association, the signatories of which promised to hunt down and kill anyone who conspired against Elizabeth. The Act for the