José António Carlos de Seixas (June 11, 1704 – August 25, 1742) was a pre-eminent Portuguese composer of the 18th century.
 An accomplished virtuoso of both the organ and the harpsichord, Seixas succeeded his father as the organist for Coimbra Cathedral at the age of fourteen.
 In 1720, he departed for the capital, Lisbon, where he was to serve as the organist for the royal chapel, one of the highest offices for a musician in Portugal, a position which earned him a knighthood.
 Much of Seixas’ music rests in an ambiguous transitional period from the learned style of the 17th century to the galant style of the 18th century.
Jean-Jacques Rousseau ( ; ] ; 28 June 1712 – 2 July 1778) was a Francophone Genevan philosopher, writer, and composer of the 18th century.
 His political philosophy influenced the Enlightenment in France and across Europe, as well as aspects of the French Revolution and the overall development of modern political and educational thought.
Jovan Rajić (; September 21, 1726 – December 22, 1801) was a Serbian writer, historian, traveller, and pedagogue, considered one of the greatest Serbian academics of the 18th century.
 He was one of the most notable representatives of Serbian Baroque literature along with Zaharije Orfelin, Pavle Julinac, Vasilije III Petrović-Njegoš, Simeon Končarević, Simeon Piščević, and others (although he worked in the first half of 18th century, as Baroque trends in Serbian literature emerged in the late 17th century).
Gavrilo "Gavril" Stefanović Venclović ( ; fl.
 1670–1749) was a Serbian priest, writer, poet, orator, philosopher, polyglot, and illuminator.
 He was one of the first and most notable representatives of Serbian Baroque literature (although he worked in the first half of 18th century, as Baroque trends in Serbian literature emerged in the late 17th century).
 But Venclović's most unforgettable service to his nation was his initial contribution as a scholar to the development of the vernacular – what was to become, a century later, the Serbian literary language.
David Charles Johnson (27 October 1942 in Edinburgh – 30 March 2009 in Edinburgh) was a Scottish composer and a scholar of 18th century Scottish music.
 Dr David Johnson was ‘an internationally recognised scholar’, whose work did much to rediscover and reinvent 18th century Scottish music, and set it in its historical context.
 Johnson’s key legacy is to leave behind a body of writing and editions which throws light on the music and wider social life of 18th century lowland Scotland, its influences and tastes, and the key musical figures within it.
The quadrille is a dance that was fashionable in late 18th- and 19th-century Europe and its colonies.
 Performed by four couples in a rectangular formation, it is related to American square dancing.
 The Lancers, a variant of the quadrille, became popular in the late 19th century and was still danced in the 20th century in folk-dance clubs.
 A derivative found in the Francophone Lesser Antilles is known as "kwadril", and the dance is also still found in Madagascar and is within old Jamaican / Caribbean culture.
The history of coal mining goes back thousands of years.
 It became important in the Industrial Revolution of the 19th and 20th centuries, when it was primarily used to power steam engines, heat buildings and generate electricity.
 Coal mining continues as an important economic activity today.
 Compared to wood fuels, coal yields a higher amount of energy per mass and can often be obtained in areas where wood is not readily available.
 Though it was used historically as a domestic fuel, coal is now used mostly in industry, especially in smelting and alloy production as well as electricity generation.
 Large-scale coal mining developed during the Industrial Revolution, and coal provided the main source of primary energy for industry and transportation in industrial areas from the 18th century to the 1950s.
 Coal remains an important energy source because of its low cost and abundance compared to other fuels, particularly for electricity generation.
 Coal is also mined today on a large scale by open pit methods wherever the coal strata strike the surface or are relatively shallow.
 Britain developed the main techniques of underground coal mining from the late 18th century onward, with further progress being driven by 19th century and early 20th century progress.
 However, oil and gas were increasingly used as alternatives from the 1860s onward.
Marie-Thérèse Levasseur (21 September 1721 - 17 July 1801; also known as Thérèse Le Vasseur and Thérèse Lavasseur) was the domestic partner of Genevan philosopher Jean-Jacques Rousseau.
Louise Marie-Thérèse, also known as "The Negroid Nun of Moret" (16 November 1664 – 1732), was a French nun and the subject of accounts from the 18th century in which she is claimed to be the daughter of the Queen of France, Maria Theresa of Spain.
 Her existence is mentioned in several different sources.
Danish literature, a subset of Scandinavian literature, stretches back to the Middle Ages.
 The earliest preserved texts from Denmark are runic inscriptions on memorial stones and other objects, some of which contain short poems in alliterative verse.
 In the late 12th century Saxo Grammaticus wrote "Gesta Danorum".
 During the 16th century, the Lutheran Reformation came to Denmark.
 During this era, Christiern Pedersen translated the New Testament into Danish and Thomas Kingo composed hymns.
 Fine poetry was created in the early 17th century by Anders Arrebo (1587–1637).
 The challenges faced during Denmark's absolute monarchy in 1660 are chronicled in "Jammersminde" (Remembered Woes) by Leonora Christina of the Blue Tower.
 Ludvig Holberg (1684–1754), influenced by the ideas of the Enlightenment and Humanism, is considered the founder of modern Danish and Norwegian literature.
 Neoclassical poetry, drama, and the essay flourished during the 18th century influenced by French and English trends.
 German influence is seen in the verse of the leading poets of the late 18th century such as Johannes Ewald and Jens Baggesen.
 Other 18th century writers include the hymn writer Hans Adolph Brorson and the satirical poet Johan Herman Wessel.

Question: Marie-Thérèse Levasseur was the domestic partner to which Francophone Genevan philosopher, writer, and composer of the 18th century?
Answer: Jean-Jacques Rousseau