The Honourable Society of Gray's Inn, commonly known simply as Gray's Inn, is one of the four Inns of Court in London. To be called to the Bar and practise as a barrister in England and Wales, an individual must belong to one of these Inns. Having existed for over 600 years, members of Gray's Inn include many noted lawyers and judges, such as Francis Bacon, Baron Slynn, Lord Bingham of Cornhill, Lord Hoffmann and others. Outside the Bar and judiciary of England and Wales, members have included the clergy (including five Archbishops of Canterbury), industrialists like John Wynne, astronomers such as John Lee, media figures, like Huw Thomas, and members of the Bar and judiciary of other nations, such as Yang Ti-liang (former Chief Justice of the Supreme Court of Hong Kong) and Aitzaz Ahsan (