Chatham House Chatham House The Royal Institute of International Affairs, commonly known as Chatham House, is a not-for-profit and non-governmental organisation based in London whose mission is to analyse and promote the understanding of major international issues and current affairs. It is the originator of the Chatham House Rule and takes its name from the building where it is based, a Grade I listed 18th-century house in St James's Square, designed in part by Henry Flitcroft and occupied by three British prime ministers, including William Pitt, 1st Earl of Chatham. In the University of Pennsylvania’s rankings (announced in January 2017) for their
Hester Pitt, Countess of Chatham over twenty years as a friend of her brothers, on 16 November 1754 at her home in Argyle Street, London. They spent their ten-day honeymoon at West Wickham, Kent. The marriage was a happy one and the couple moved to a house in Hayes, Kent in 1756. They had five children: On 4 December 1761, she was created Baroness Chatham, of Chatham, in the County of Kent, with remainder to her sons by William Pitt, who was later created Earl of Chatham in 1766. Hester Pitt, Countess of Chatham Hester Pitt, Countess of Chatham, 1st Baroness Chatham (; 8 November