Westminster St James in the context of "St James's"

St James's is a district of Westminster, and a central district in the City of Westminster, London, forming part of the West End. The area was once part of the northwestern gardens and parks of St. James's Palace and much of it is still owned by the Crown Estate. During the Restoration in the 17th century, the area was developed as a residential location for the British aristocracy, and around the 19th century was the focus of the development of their gentlemen's clubs. Once part of the parish of St Martin in the Fields, much of it formed the parish of St James from 1685 to 1922. Since the Second World War the area has transitioned from residential to commercial use.

St James's is bounded to the north by Piccadilly and Mayfair, to the west by Green Park, to the south by The Mall and St. James's Park, and to the east by Haymarket.

Piccadilly (/ˌpɪkəˈdɪli/) is a road in the City of Westminster, London, England, to the south of Mayfair, between Hyde Park Corner in the west and Piccadilly Circus in the east. It is part of the A4 road that connects central London to Hammersmith, Earl's Court, Heathrow Airport and the M4 motorway westward. St James's is to the south of the eastern section, while the western section is built up only on the northern side. Piccadilly is just under 1 mile (1.6 km) in length, and it is one of the widest and straightest streets in central London.

The street has been a main thoroughfare since at least medieval times, and in the Middle Ages was known as "the road to Reading" or "the way from Colnbrook". Around 1611 or 1612, Robert Baker acquired land in the area, and prospered by making and selling piccadills. Shortly after purchasing the land, he enclosed it and erected several dwellings, including his home, Pikadilly Hall. What is now Piccadilly was named Portugal Street in 1663 after Catherine of Braganza, wife of Charles II, and grew in importance after the road from Charing Cross to Hyde Park Corner was closed to allow the creation of Green Park in 1668. Some of the most notable stately houses in London were built on the northern side of the street during this period, including Clarendon House and Burlington House in 1664. Berkeley House, constructed around the same time as Clarendon House, was destroyed by a fire in 1733 and rebuilt as Devonshire House in 1737 by William Cavendish, 3rd Duke of Devonshire. It was later used as the main headquarters for the Whig party. Burlington House has since been home to several noted societies, including the Royal Academy of Arts, the Geological Society of London, the Linnean Society, and the Royal Astronomical Society. Several members of the Rothschild family had mansions at the western end of the street. St James's Church was consecrated in 1684 and the surrounding area became St James Parish.