Year 1657 (MDCLVII) was a common year starting on Monday (link will display the full calendar) of the Gregorian calendar and a common year starting on Thursday of the 10-day slower Julian calendar.

Sir Christopher Wren FRS (20 October 1632 – 25 February 1723) is one of the most highly acclaimed English architects in history. He was accorded responsibility for rebuilding 51 churches in the City of London after the Great Fire in 1666, including his masterpiece, St. Paul's Cathedral, on Ludgate Hill, completed in 1710. The principal creative responsibility for a number of the churches is now more commonly attributed to others in his office, especially Nicholas Hawksmoor. Other notable buildings by Wren include the Royal Naval College in Greenwich and the south front of Hampton Court Palace.

Educated in Latin and Aristotelian physics at the University of Oxford, Wren was a notable astronomer, geometer, and mathematician-physicist, as well as an architect. He was a founder of the Royal Society (president 1680–82), and his scientific work was highly regarded by Sir Isaac Newton and Blaise Pascal.

Wren was born at East Knoyle in Wiltshire, the only surviving son of Christopher Wren DD (1589–1658), at that time the rector of East Knoyle and later Dean of Windsor. A previous son of Dr Wren, also named Christopher, was born on 22 November 1631 and died the same day. John Aubrey’s confusion of the two persisted occasionally into late twentieth-century literature.

Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader who was part of the joint republican, military and parliamentarian effort that overthrew the Stuart monarchy as a result of the English Civil War, and was subsequently invited by his fellow leaders to assume a head of state role in 1653. As such, Cromwell ruled as "Lord Protector" for a five-year segment (1653–58) of the 11-year period of republican Commonwealth and protectorate rule of England, and nominally of Ireland, Wales and Scotland. As one of the commanders of the New Model Army, he played an important role in the defeat of the King's forces, the royalists in the English Civil War. After the execution of King Charles I in 1649, Cromwell dominated the short-lived Commonwealth of England, conquered Ireland and Scotland, ruling as Lord Protector from 1653 until his death in 1658.

Cromwell was born into the ranks of the middle gentry, and remained relatively obscure for the first 40 years of his life. Along with his brother, Henry, he kept a small holding of chickens and sheep, selling eggs and wool to support himself. His lifestyle resembled that of a yeoman farmer until he received an inheritance from his uncle. After undergoing a religious conversion during the same decade, Cromwell made an independent style of puritanism an essential part of his life. He took a generally (but not completely) tolerant view towards the many Protestant sects of his period. As a ruler he executed an aggressive and effective foreign policy and did as much as any English leader to shape the future of the land he governed. But his Commonwealth collapsed after his death and the royal family was restored in 1660. An intensely religious man—a self-styled Puritan Moses — he fervently believed God was guiding his victories.

Nicolas Fouquet, marquis de Belle-Île, vicomte de Melun et Vaux (January 27, 1615 – March 23, 1680) was the Superintendent of Finances in France from 1653 until 1661 under King Louis XIV. He fell out of favor with the young king, probably because of his extravagant displays of wealth, and the king had him imprisoned from 1661 until his death in 1680.

Nicolas Fouquet was born in Paris, he belonged to an influential family of the noblesse de robe and, after some preliminary schooling with the Jesuits at the age of thirteen, was admitted as avocat at the Parlement of Paris. While still in his teens, he held several responsible posts, and, in 1636, when just twenty, he was able to buy the post of maître des requêtes. In 1640 he married the rich Louise Fourché, who died a year later.

From 1642 to 1650, he held various intendancies, at first in the provinces and then with the army of chief minister Cardinal Mazarin and, coming thus in touch with the court, was permitted in 1650 to buy the important position of procureur général to the parlement of Paris. During Mazarin's exile, Fouquet remained loyal to him, protecting his property and keeping him informed of the situation at court.