Holstein-Gottorp or Schleswig-Holstein-Gottorp is the historiographical name, as well as contemporary shorthand name, for the parts of the duchies of Schleswig and Holstein, also known as Ducal Holstein, that were ruled by the dukes of Schleswig-Holstein-Gottorp. Other parts of the duchies were ruled by the kings of Denmark. The territories of Gottorp are located in present-day Denmark and Germany. The main seat of the dukes was Gottorf Castle in the city of Schleswig in the duchy of Schleswig. It is also the name of the ducal house, which ascended to several thrones. For this reason genealogists and historians sometimes use the name of Holstein-Gottorp for related dynasties of other countries.

The formal title adopted by these rulers was "Duke of Schleswig, Holstein, Dithmarschen and Stormarn", but that title was also used by his kinsmen, the kings of Denmark and their cadet branches, as it was the common property of all these agnates. The Gottorp branch held Landeshoheit (sovereignty) over the duchy of Holstein in the Holy Roman Empire and over the duchy of Schleswig in the kingdom of Denmark.^{[citation needed]} The name Holstein-Gottorp is for the sake of convenience used instead of the technically more correct "Duke of Schleswig and Holstein in/at Gottorp".^{[citation needed]}

Gustaf VI Adolf (Oscar Fredrik Wilhelm Olaf Gustaf Adolf, 11 November 1882 – 15 September 1973) was King of Sweden from 29 October 1950 until his death. His official title was King of Sweden, of the Goths and of the Wends. He was the eldest son of King Gustaf V and his wife Victoria of Baden. Gustaf VI Adolf was a descendant of the Bernadotte kings of Sweden, as well as the House of Vasa. Through his mother Victoria, he was also a descendant of Gustav IV Adolf of Sweden of the deposed House of Holstein-Gottorp.

He was born at the Royal Palace in Stockholm and at birth created Duke of Skåne. On 29 October 1950, he succeeded his father on the throne.

The King's reputation as a "professional amateur professor" was widely known; nationally and internationally, and among his relatives. Gustaf VI Adolf was a devoted archaeologist, and was admitted to the British Academy for his work in botany in 1958. Gustaf VI Adolf participated in archaeological expeditions in China, Greece, Korea and Italy, and founded the Swedish Institute at Rome.

Catherine II, also known as Catherine the Great (Russian: Екатерина II Великая, Yekaterina II Velikaya; German: Katharina die Große), Empress of Russia (2 May [O.S. 21 April] 1729 – 17 November [O.S. 6 November] 1796), was the most renowned and the longest-ruling female leader of Russia, reigning from 9 July [O.S. 28 June] 1762 until her death at the age of 67. She was born in Stettin, Pomerania, Prussia as Sophie Friederike Auguste von Anhalt-Zerbst-Dornburg, and came to power following a coup d'état and the assassination of her husband, Peter III, at the end of the Seven Years' War. Russia was revitalised under her reign, growing larger and stronger than ever and becoming recognised as one of the great powers of Europe.

In both her accession to power and in rule of her empire, Catherine often relied on her noble favourites, most notably Grigory Orlov and Grigory Potemkin. Assisted by highly successful generals such as Pyotr Rumyantsev and Alexander Suvorov, and admirals such as Fyodor Ushakov, she governed at a time when the Russian Empire was expanding rapidly by conquest and diplomacy. In the south, the Crimean Khanate was crushed following victories over the Ottoman Empire in the Russo-Turkish wars, and Russia colonised the vast territories of Novorossiya along the coasts of the Black and Azov Seas. In the west, the Polish-Lithuanian Commonwealth, ruled by Catherine's former lover, king Stanisław August Poniatowski, was eventually partitioned, with the Russian Empire gaining the largest share. In the east, Russia started to colonise Alaska, establishing Russian America.

Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/ STE-fə-nee jurr-mə-NAH-tə; born March 28, 1986), known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and was signed with Streamline Records by the end of 2007. During her employment as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.

Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the The Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro". The album's success allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles, including "Born This Way", "Judas" and "The Edge of Glory". Besides her musical career, she involves herself with humanitarian causes and LGBT activism.

Duchess Sophia Charlotte of Oldenburg (2 February 1879 – 29 March 1964) was a member of the House of Holstein-Gottorp. She was the only surviving child of Frederick Augustus II, Grand Duke of Oldenburg by his first wife Princess Elisabeth Anna of Prussia.

Sophia Charlotte ("Lotte") is best known for her unhappy and well-publicized marriage to Prince Eitel Friedrich, second son of Wilhelm II, German Emperor. The marriage later led to divorce; Sophia Charlotte would remarry a few years later to Harald van Hedemann, a former police officer.

Sophia Charlotte (or "Lotte") was born on 2 February 1879 in the dynastic residence Oldenburg Castle in Oldenburg, Germany. She was the eldest child of Frederick Augustus, the then Hereditary Grand Duke of Oldenburg and his wife Elisabeth Anna of Prussia. Sophia Charlotte had a younger sister named Margaret, but she died young. She was named after Sophia Charlotte of Hanover, the wife of the first Prussian king Frederick I.^{[citation needed]} Sophia Charlotte was her father's constant companion as they went yachting on trips together; due to these trips, she always had a great love of water like her father. She spent much of her girlhood abroad, and often visited her maternal aunt Louise Margaret, Duchess of Connaught and Strathearn in London. She also often stayed with her widowed maternal grandmother Princess Frederick Charles of Prussia in Italy.