The Royal Mews, Buckingham Palace Road, Westminster, London SW1

From Wikipedia:

“The Royal Mews is a mews, or collection of equestrian stables, of the British royal family. In London these stables and stable-hands’ quarters have occupied two main sites in turn, being located at first on the north side of Charing Cross, and then (since the 1820s) within the grounds of Buckingham Palace.
The Royal Mews, Buckingham Palace, includes an extensive display of royal carriages and other associated items, and is open to the public for much of the year. It is also a working part of the palace, where horses and people live and work, and where carriages and cars are in daily use supporting the work of the monarch as head of state.
The titular head of the Royal Mews is the Master of the Horse (one of the three great officers of the Royal Household). The executive head is the Crown Equerry, who lives on site and oversees the Royal Mews Department (which is a department of the Royal Household).

The present Royal Mews is in the grounds of Buckingham Palace, to the south of Buckingham Palace Gardens, near Grosvenor Place.
In the 1760s George III moved some of his day-to-day horses and carriages to the grounds of Buckingham House, which he had acquired in 1762 for his wife’s use. The Riding School, thought to be by William Chambers, dates from this period (it was completed in 1764; the pediment, with sculptural motifs by William Theed, was added in 1859).

“As the eighth of his Twelve Labours, also categorised as the second of the Non-Peloponnesian labours, Heracles was sent by King Eurystheus to steal the Mares from Diomedes. The mares’ madness was attributed to their unnatural diet which consisted of the flesh of unsuspecting guests or strangers to the island. Some versions of the myth say that the mares also expelled fire when they breathed. The Mares, which were the terror of Thrace, were kept tethered by iron chains to a bronze manger in the now vanished city of Tirida and were named Podargos (the swift), Lampon (the shining), Xanthos (the yellow) and Deinos (or Deinus, the terrible). Although very similar, there are slight variances in the exact details regarding the mares’ capture.” (Wikipedia)

The main royal stables housing the ceremonial coaches and their horses remained at the King’s Mews, Charing Cross; however, when his son George IV had Buckingham Palace converted into the main royal residence in the 1820s the whole stables establishment was moved there.

The current Royal Mews was built to designs by John Nash and was completed in 1825 (though the mews buildings have been modified extensively since). The main quadrangle was laid out with coach houses on the east side, and stable blocks (alternating with harness and forage rooms) on the west. Beyond it, the ‘back mews’ included accommodation for a veterinary surgeon.”