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 Cecil to counteract plots against Elizabeth. He was instrumental in the collapse of the Ridolfi plot, which hoped to replace Elizabeth with the Catholic Mary, Queen of Scots. He is credited with writing propaganda decrying a conspiratorial marriage between Mary and Thomas Howard, 4th Duke of Norfolk, and Roberto di Ridolfi, after whom the plot was named, was interrogated at Walsingham's house. In 1570, the Queen chose Walsingham to support the Huguenots in their negotiations with Charles IX of France. Later that year, he succeeded Sir Henry Norris as English ambassador in Paris. One of his duties was to continue