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Elizabeth I (7 September 1533 – 24 March 1603)[a] was Queen of England and Ireland from 17 November 1558 until her death in 1603. Elizabeth was the last monarch of the House of Tudor and is sometimes referred to as the "Virgin Queen".[1] After the pope declared her illegitimate in 1570 and released her subjects from obedience to her (this is <mark>ed text), several conspiracies threatened her life, all of which were defeated with the help of her ministers' secret service, run by Francis Walsingham.

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France originated as West Francia (Francia Occidentalis), the western half of the Carolingian Empire, with the Treaty of Verdun (843). A branch of the Carolingian dynasty continued to rule until 987, when Hugh Capet was elected king and founded the Capetian dynasty. The territory remained known as Francia and its ruler as rex Francorum ("king of the Franks") well into the High Middle Ages. The first king calling himself rex Francie ("King of France") was Philip II, in 1190, and officially from 1204. From then, France was continuously ruled by the Capetians and their cadet lines—the Valois and Bourbon—until the monarchy was abolished in 1792 during the French Revolution. The Kingdom of France was also ruled in personal union with the Kingdom of Navarre over two time periods, 1284–1328 and 1572–1620, after which the institutions of Navarre were abolished and it was fully annexed by France (though the King of France continued to use the title "King of Navarre" through the end of the monarchy).

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Sodium

Sodium is a chemical element; it has symbol Na (from Neo-Latin natrium) and atomic number 11.

Platinum

Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver".

Dysprosium

Dysprosium was first identified in 1886 by Paul Émile Lecoq de Boisbaudran, but it was not isolated in pure form until the development of ion-exchange techniques in the 1950s.

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The infinite sum $\sum _{n=1}^{\mathrm{\infty }}\frac{1}{n^2}$ = $\frac{{\pi }^2}{6}$

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