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 negotiations for a marriage between Elizabeth and Charles IX's younger brother Henry, Duke of Anjou. The marriage plan was eventually dropped on the grounds of Henry's Catholicism. A substitute match with the next youngest brother, Francis, Duke of Alençon, was proposed but Walsingham considered him ugly and "void of a good humour". Elizabeth was 20 years older than Alençon, and was concerned that the age difference would be seen as absurd. Walsingham believed that it would serve England better to seek a military alliance with France against Spanish interests. The defensive Treaty of Blois was concluded between France and England