The best known Latin translation of Arithmetica was made by Bachet in 1621 and became the first Latin edition that was widely available.

Bacon was knighted in 1603, and created both the Baron Verulam in 1618 and the Viscount St. Alban in 1621 ; as he died without heirs, both peerages became extinct upon his death.

Peers were also invested, but investitures for peers ceased in 1621, during a time when peerages were being created so frequently that the investiture ceremony became cumbersome.

His eldest surviving son, Philip ( 1621 – 1669 ), became 5th Earl of Pembroke, and 2nd Earl of Montgomery ; he was twice married, and was succeeded in turn by three of his sons, of whom Thomas, the 8th Earl ( c. 1656 – 1733 ), was a person of note during the reigns of William III and Anne.

After the division of Mecklenburg ( 1621 ), Schwerin became the capital of the Duchy of Mecklenburg-Schwerin.

After the division of Mecklenburg ( 1621 ) it became the capital of the small duchy of Mecklenburg-Güstrow.

Olivares rapidly became Philip's most trusted advisor and when Philip ascended the throne in 1621, at the age of sixteen, he showed his confidence in Olivares by ordering that all papers requiring the royal signature should first be sent to the count-duke.

Educated by the Jesuits, he became King of Hungary in 1625, King of Bohemia in 1627 and Archduke of Austria in 1621.

His predecessor in the post was a relation of Jacques Benigne Bossuet, and it is thought that the transaction was the cause of La Bruyère's introduction to the great orator Bossuet, who from the date of his own preceptorship of the Dauphin, was a kind of agent-general for tutorships in the royal family, introduced him in 1684 to the household of the Louis, Prince of Condé ( 1621 – 1686 ), to whose grandson Louis as well as to that prince's girl-bride Mlle de Nantes, one of Louis XIV's natural children, La Bruyère became tutor.

From 1621 to 1624 he was intendant of Guyenne, where he became closely allied with the duc d ' Épernon.

The gardens became commonly used as a place of relaxation, and James Howell wrote in 1621 that " I hold Inn Walks to be the pleasantest place about London, and that there you have the choicest society ".

A sermon pronounced before Philip III at Salamanca in 1605 brought Paravicino into notice ; he rose to high posts in his order, was entrusted with important foreign missions, became royal preacher in 1616, and on the death of Philip III in 1621 delivered a famous funeral oration which was the subject of acute controversy.

His father was a son of John Doddridge ( 1621 – 1689 ), rector of Shepperton, Middlesex, who resigned his living after the Act of Uniformity of 1662 and became a nonconformist minister, and a great-nephew of the judge and MP Sir John Doddridge ( 1555 – 1628 ).

In 1621 he became first commissioner for the great seal and was elected MP for Maldon.

He became President of the Council in 1621, in which office he was continued by Charles I, who created him Earl of Manchester in 1626.

He was ordained in 1618, and through the influence of John Williams became rector in 1621 of Stoke Hammond, Buckinghamshire, and Kirkby Underwood, Lincolnshire.

* Francis Bacon, 1st Baron Verulam ( 1561 – 1626 ) ( became Viscount St Albans in 1621 )

In April 1621 he became colonial treasurer of the Virginia Company and sailed to Virginia with his niece's husband, Sir Francis Wyat, the new governor.

In 1618 Guy became mayor of Bristol and was a member of the merchant venturers ' court of assistants in 1620 and 1621.

Guru Tegh Bahadur Sahib Ji ( ; 1 April 1621 – 24 November 1675 ) became the 9th Guru Ji of Sikhs on 20 March 1665, following in the footsteps of His Grand-Nephew, Guru Har Krishan Sahib Ji.

In Königsberg he became friends with and collaborated with Heinrich Albert ( 1604 – 1651 ), Robert Roberthin ( 1600 – 1648 ) and Sibylla Schwarz ( 1621 – 1638 ), and with them formed the Königsberger Dichtergruppe ( loosely translated as the " Königsberg Poets ' Association ").

And just a month and half later, on May 12, 1621, Edward Winslow and Susanna White became the first couple to marry in Plymouth Colony.

He became chaplain to Sir Henry Willoughby, who presented him in 1621 to the rectory of Hilgay, Norfolk, where he married and spent the rest of his life.

In 1618 he became commissioner of the treasury, and in 1621 he was raised to the peerage with the title of Baron Brooke, a title which had belonged to the family of his paternal grandmother.

In 1606 he was appointed vicar of Bumpsted Steeple, Essex ; in 1608 he was rector of Cheam, Surrey, and on 18 December 1621 he became dean of Gloucester.

" The Nassau Cavalcade ", members of the house of Orange and Nassau on parade in 1621 from an engraving by Willem Delff.

Due to the inheritance laws of the house of Welden, the market town was divided into two different territories, Großlaupheim and Kleinlaupheim ( Great Laupheim and Little Laupheim ), in 1621, at the beginning of the Thirty Years ' War ( 1618 – 1648 ), each territory being ruled by its own dynasty.

The name of the house derives from its purchase by Fulke Greville, 1st Baron Brooke in 1621 — which led to ownership by the family for over 200 years.

The house was built in approximately 1615 for the writer, translator, and literary patron Mary Sidney Herbert, Dowager Countess of Pembroke ( born 27 October 1561 ) but she died of smallpox on 25 September 1621, not long after its completion.

William Senior's 1621 survey indicates that the park was then made up of a series of enclosures with the main entrance to the house from the east, approached by a walk or avenue.

During the 17th century, the French fabulist Jean de La Fontaine ( 1621 – 1695 ) saw the soul of the fable in the moral — a rule of behavior.

* Jean de La Fontaine ( French, 1621 – 95 ).

* 1621 – Jean de La Fontaine, French writer ( d. 1695 )

* April 13 – Jean de la Fontaine, French writer noted for his fables ( b. 1621 )

In 1621, sixty years after Garamond ’ s death, the French printer Jean Jannon issued a specimen of typefaces that had some characteristics similar to the Garamond designs, though his letters were more asymmetrical and irregular in slope and axis.

Françoise Bertaut de Motteville ( c. 1621 – 1689 ), French memoir writer, was the daughter of Pierre Bertaut, a gentleman of the king's chamber, and niece of the bishop-poet Jean Bertaut.

* Jean de La Fontaine ( 1621 – 1695 )

* Jean de La Fontaine ( 1621 – 1695 )

Title page of the 1621 edition of Diophantus ' Arithmetica, translated into Latin by Claude Gaspard Bachet de Méziriac.

The 1621 edition of Arithmetica by Bachet gained fame after Pierre de Fermat wrote his famous " Last Theorem " in the margins of his copy:

Galileo initially called his discovery the Cosmica Sidera (" Cosimo's stars "), in honour of Cosimo II de ' Medici ( 1590 – 1621 ).

* 1621 – Anne de Xainctonge, French saint, founder of the Society of the Sisters of Saint Ursula of the Blessed Virgin ( b. 1567 )

* 1707 – Philibert, comte de Gramont, French writer ( b. 1621 )

After the death of Cosimo II de ' Medici in 1621, he returned to Nancy where he lived for the rest of his life, visiting Paris and the Netherlands later in the decade.

* 1590 – Cosimo II de ' Medici, Grand Duke of Tuscany ( d. 1621 )

Title page of the 1621 edition of Diophantus ' Arithmetica, translated into Latin by Claude Gaspard Bachet de Méziriac.

* January 10 – Philibert, comte de Gramont, French writer ( b. 1621 )

* Diego Fernández de Córdoba, Marquis of Guadalcázar of Spain ( 1578 – 1630 ), nobleman and Viceroy of New Spain and Peru, in office 1612 – 1621 ( New Spain ), 1622 – 1629 ( Peru )

* January 9 – Charles Bonaventure de Longueval, Count of Bucquoy, soldier in Habsburg service ( d. 1621 )

de: 1621

* May 15 – Hendrick de Keyser, Dutch architect and sculptor ( d. 1621 )

* May 12 – Cosimo II de ' Medici, Grand Duke of Tuscany ( d. 1621 )

* August 5 – Charles de Luynes, first duke of Chaulnes ( d. 1621 )

* November 21 – Anne de Xainctonge, French saint ( d. 1621 )

** Louis II de Bourbon, Prince de Condé, French general ( b. 1621 )

* Ferdinando II de ' Medici, Grand Duke of Tuscany ( 1610 – 1670 ), grand duke in 1621

Some well known architects of the period were Jacob van Campen ( 1595 – 1657 ), Lieven de Key ( c. 1560 – 1627 ) and Hendrik de Keyser ( 1565 – 1621 ).