|King Constantine and Queen Sophie with their family.|
On October 27, 1889, Crown Prince Constantine (later King) of Greece and Princess Sophie of Prussia were married in Athens, Greece. The heir to the Greek throne, then known as the Duke of Sparta, was born in 1868, the first child of King George I of Greece and Grand Duchess Olga Constantinovna of Russia. The bride, meanwhile, was born in 1870, the seventh child of then-Crown Prince Frederick of Prussia and Victoria, Princess Royal, the first child of Queen Victoria of the United Kingdom. In 1888, Sophie’s father succeeded as German Emperor and King of Prussia, albeit he reigned for all but only three months.
The wedding was the biggest gathering that Athens had seen for centuries and everyone was in an upbeat mood. It gathered royal guests from Germany, Denmark, Great Britain and Russia. Among the royals present for this grand occasion included the bride’s mother, the Empress Frederick, together with the Kaiser Wilhelm II, Empress Augusta Victoria, and Prince Henry of Prussia. The Danish delegation was led by the groom's grandparents, King Christian IX and Queen Louise, while from Russia, the Czarevitch (and future Czar) Nicholas, represented his father Czar Alexander III. The Prince and Princess of Wales also took the long trip from London to the Greek capital, together with their children, Prince Albert Victor, Prince George, Princess Victoria, and Princess Maud. Other royals who went to Greece for the wedding were the Prince of Mecklenburg-Schwerin and the Hereditary Prince and Princess of Saxe-Meiningen.
Athens, however, proved too small for the huge flock of royals and their retinue who swarmed to the Greek capital. King George I could not accommodate them all in his palace so he requested members of the Greek high society to receive some of his guests in their mansions. The king also turned to his subjects to lend him horses and carriages to transport all visitors during the festivities. Additional liveries for the lackeys at the service for the foreign visitors were hastily purchased in time for the wedding 
The ceremonies commenced at 11 in the morning, with the royal procession headed by a squadron of royalty. The carriages paraded from the Royal Palace to the Cathedral of Athens. The bride, accompanied by Queen Olga, was transported by a "gorgeous state carriage… drawn by six black horses, covered with silver trimmings," and was escorted on horseback by King George I on one side and by the Duke of Sparta on the other. 
The route of the wedding procession was lined by soldiers and behind them were a throng of adoring Greeks eager to catch a glimpse of their prince and new princess.
The kaiser and kaiserin draw significant attention; he was wearing a "handsome uniform and jewelled orders", while his wife displayed her magnificent diamonds. 
The New York Times described the scene at the cathedral as "a brilliant one, the uniforms of the assembled dignitaries and the super dresses and jewels of the ladies forming a splendid spectacle. The centre aisle of the church was strewn with roses." 
The Orthodox service ran for more than an hour and it was necessary for those who held the golden coronets on the heads of the bride and groom to alternate. Prince Henry of Prussia, Prince Victor and Prince George of Wales alternated in holding the groom's coronet above his head; while the Czarevitch Nicholas, Prince Waldemar and Prince George of Greece swapped in keeping the bride's crown. 
After the ceremony, the wedding party returned to the Royal Palace where the marriage was also solemnized in the Lutheran rites at the king's private chapel.
The couple proceeded to the crown prince's villa and while along the way, the locals cheered their new princess, who responded with endless smile and nod. They made a balcony appearance before a rejoicing citizenry who waived and shouted their approval to Princess Sophie.
A gala banquet was hosted at the Royal Palace that evening, the grounds glowing with "a blaze of illuminations and Bengal fires."  Athens' nighttime skyline brightened with pyrotechnic spectacle displayed at the Acropolis and the Champ de Mars. At the Syntagma Square, Greeks gathered and celebrated for hours after the ceremonies.
The crown prince and princess received an outpour of presents from every part of Europe. From Czar Alexander III, they received "valuable brilliants, a silver and crystal set, and a captain's uniform of the Neva regiment." 
The Empress Frederick reported the entire ceremony to Queen Victoria, telling her mother that: "My darling Sophie looked so sweet and grace and calm, my little lamb... her neck and throat looked so white and pretty, and the wreath fitted so nicely and close round her head. The gown was of white satin with a tablier of cloth of silver trimmed with lillies on lace and garlands of orange blossom and myrtle... The only contretemps was the veil, having disappeared... she had to wear a plain tulle one..." 
Foreign presses also extended their congratulations to the couple. The North German Gazette published a poem in Greek, while Vossiche Zeitung praised the princess for having "followed the wishes of her heart." In Vienna, the Fremdenblatt found the wedding to be a union that served as "another bond among European nations." 
Never before had the shores of this Balkan kingdom welcomed yachts and ships from the most powerful countries in Europe, not because of war, but because of royals trying to outdo each other in greatness and grandness. The presence of Kaiser Wilhelm II and Empress Augusta Victoria, in particular, caused tension among those present, especially with the Greek hosts. Wanting to showcase the might of Germany (or the kaiser’s boisterous nature), the couple brought more than 20 attendants for the trip and took every chance to offend the king and queen. The empress snobbed Queen Olga, who the Greeks loved for her affable and pious nature. The empress never forgot that Queen Olga was a Russian grandduchess and remembered how the Romanov court snobbed her husband in one of his visits. The kaiser fared worse, angering King George after the former brought his own Lutheran pastor and insisted that the couple be married on Lutheran rites as well. Insulted, the king refused to meet his German guests face-to-face while the Hohenzollern couple felt slighted by the seeming haughtiness of the Greek pair. 
Holden, A. (1937). Four Generations of our Royal Family. London: George Allen & Unwin Ltd., p148.
Vovk, J.C. (2014). Imperial Requiem: Four Royal Women and the Fall of the Age of Empires. Bloomington, Indiana: iUniverse, p.71.
Van der Kiste, John (1994). Kings of the Hellenes : The Greek Kings, 1863-1974.