The centenary of the House of Windsor has been commemorated with a new coin.
The Royal Family's name was radically switched 100 years ago in 1917 because of anti-German feeling during the First World War.
King George V decided that it was inappropriate for the royals to hold the German name Saxe-Coburg-Gotha - which came to the family in 1840 with the marriage of Queen Victoria to Prince Albert - while Britain was fighting Germany.
On July 17 1917, the king issued a royal proclamation changing the royals' house and surname, declaring that they would "be styled and known as the House and Family of Windsor".
Windsor Castle - one of the Queen's favourite retreats - was built in the 11th century and is the oldest and largest continually occupied castle in Europe.
The Royal Mint's £5 coins feature the Castle's Round Tower flying the Royal Standard, surrounded by sprigs of oak.
The image is based on the Badge of the House of Windsor - originally approved by the Queen's father George VI.
Among the commemorative coins available are a £5 Brilliant Uncirculated Coin, which costs £13, a £5 Silver Proof Coin for £82.50 and a £5 22-carat Gold Proof Coin, priced at £1,945.
The House of Windsor has seen four monarchs so far - George V, Edward VIII, George VI and the nation's longest reigning monarch Elizabeth II.
But it also experienced the abdication crisis in 1936 when Edward VIII gave up the throne to marry Wallis Simpson.
After her accession, the Queen declared that the Royal Family's surname would still be Windsor and not Mountbatten, much to the Duke of Edinburgh's annoyance.
"I'm just a bloody amoeba," he is said to have shouted, when learning his children would not bear his surname.
He later won a concession in 1960 when it was announced that the Queen's direct descendants, other than those with the style of Royal Highness and the title of Prince or Princess, when they needed a surname would use Mountbatten-Windsor - although the royal house remains the House of Windsor.
Incredibly valuable coins
Incredibly valuable coins
This Australian coin was the first half crown minted under Edward VII. The price for a Melbourne coin in good condition is particularly high because around half of them were produced with faults. It’s now worth £7,500 and has risen in value some 13,789% since it was first in production
The only half crown on the list gets its position from its rarity value. However, the fact this is a silver coin rather than a gold one does affect its value - so it’s worth £10,500. It’s significantly less than others on the list - but it has still appreciated 79,445%.
This is the newest coin in the top ten, and the first year that sovereigns were produced featuring the Queen. The coin was produced in small numbers for investors - rather than for circulation - so is thought to be worth £12,500, due to its rarity.
This is another collectable gold coin prized for its rarity value. It’s worth £15,000 today and has appreciated 191,716%
This was issued in very small numbers, as it was produced during WWI. As a result, few are available - especially as uncirculated coins - so one in good condition will fetch £16,000.
This is another coin prized for its rarity, thanks to a relatively low number being minted, and more being taken out of circulation during WWI. It’s now thought to be worth £17,000 after appreciation of 42,084%.
This 1926 coin has shot up in value and is now worth £31,500. The rise in value is partly to do with a very low mintage, and partly to do with the fact that people were asked to hand their sovereigns over to be melted down during WWI, which took many of them out of circulation.
This brass threepence from 1937 has benefited enormously from the fact that Edward didn’t stick around for long to get too many coins struck in his image before he abdicated. It is now worth £45,000.
This 1933 penny has seen a stunning appreciation in value and is valued at a whopping £72,000 today. The value is due entirely to rarity. Only around seven British versions of this coin were minted, and were intended for the King to bury under the foundation stones of new buildings. They have been subject to theft, and a few are said to be in private hands now.
This isn’t the oldest coin in the list, but it was produced in a year when all gold coins were recalled and exchanged for paper money - so the vast majority were melted down. Its rarity and popularity puts it head and shoulders above the rest. It is worth an eye-watering £6,500,000, and has increased in value 2,178,885% since it was produced.