USB1161655: King Charles I on Horseback, Dyck, Anthony van (1599-1641) (after) / Bridgeman Images

USB1162885: Prince Frederick Henry, Crown Prince Palatine, aged 9 (oil on panel), Ravesteyn, Jan Anthonisz. van (c.1570-1657) (after) / Bridgeman Images

USB1162888: An Unknown Gentleman, aged 35, formerly called William Herbert, 3rd Earl of Pembroke KG, PC (1580-1630), possibly a member of the Meller family, Gheeraerts, Marcus (c.1561-1635) / Bridgeman Images

USB1158915: Sir Richard Hoare, Kt (1648 - 1718) as Lord Mayor, Richardson, Jonathan II (1694-1771) / Bridgeman Images

USB1157746: Anne Bedingfeld (1651/2-1701) as a Carmelite Nun, Flemish School, (17th century) / Bridgeman Images

XLF3780554: The angel of Jehovah kills Assyrian soldiers - Bible / Bridgeman Images

XOS778461: Samuel F.B. Morse, 1866 (b/w photo), Brady, Mathew (1823-96) / Bridgeman Images

PFH4072430: Italy: Icon of Magnus Decentius (-353), usurper emperor, from the book "Icones imperatorvm romanorvm" (Icons of Roman Emperors), Antwerp, 1645 / Bridgeman Images

PCT4296255: Iran, art of qalamkar: detail of an Iranian textile piece from Isfahan, early 20th century (circa 1900) / Bridgeman Images

PRX3117975: Study on a warrior, Rubens, Peter Paul (1577-1640) / Bridgeman Images

PFH5846113: Vietnamese puppets dancing on water, Hanoi, Vietman (photo) / Bridgeman Images

USB1162731: Henry Wriothesley, 3rd Earl of Southampton (oil on canvas), Geeraerts, Marcus, the younger (1561-1635) (studio of) / Bridgeman Images

USB1159482: William Calverley (b.1557), as a young boy, English School / Bridgeman Images

USB1157785: Imaginary Monument to Thomas Fitzwilliam (d.1513) and John Fitzwilliam (b.before 1498 - d.1513), English School, (18th century) / Bridgeman Images

XLA3764713: Gideon's victory against the Midianites, Judges, Schnorr von Carolsfeld, Julius (1794-1872) / Bridgeman Images

PIX4617879: Orion's Trapeze - Trapezium Multiple Star System in Orion - Orion's Trapeze is one of the youngest open clusters known, with new stars still forming in this region. The Trapezium is the most famous multiple star system in the entire night sky. Located at the very heart of M42, the Orion Nebula, it is one of the youngest star clusters known. The four brightest stars in the Trapezium (A, B, C and D) are easily visible in a four inch telescope with decent optical quality under good seeing conditions. They range in brightness from magnitude 5 to magnitude 8. They can be seen merged together as one star to the unaided eye as the middle star in the sword of Orion. The image above shows the four brightest stars of the Trapezium at the center of the photo. The core of M42 surrounding the Trapezium is a blue - green color from the predominantly green spectral emission line of Oxygen III, with a smaller amount of blue - green mixed in from the hydrogen - beta emission line. These particular wavelengths also happen to be the wavelengths to which the human visual system is most sensitive for color vision. Much of the rest of the Orion Nebula has a lot of red hydrogen - alpha emission, but the eye is not very sensitive to this wavelength. Some red can be seen in the brightest parts of the nebula that emit hydrogen - alpha light by observers with sensitive color vision. For most people however, if they see any color at all, it will be a very pale green, or blue - green, from the Oxygen III spectral lines / Bridgeman Images

NAM5924969: Buff coat worn by Major Thomas Sanders, 1640 circa (leather), English School, (17th century) / Bridgeman Images

MGP872788: Evelyn Waugh, 1963 (b/w photo), Gerson, Mark / Bridgeman Images

CH3059510: Rare group of orders and decorations to Lieutenant (later Captain) Samuel Edward Cook, R. N. (metal & ribbon), English School, (19th century) / Bridgeman Images

XEE4135592: Illustration for Iconology or ideas from the sphere of passions and allegories, Vienna 1801 (engraving), Austrian School, (19th century) / Bridgeman Images

NAM5922490: ‘Liberation of Europe: Special service troops fight their way inland from French beaches’, June 1944 (b/w photo), Unknown photographer, (20th century) / Bridgeman Images

NAM5927182: Study for the oil painting by William Barns Wollen, ‘The flag: Albuhera, May 16, 1811’ (charcoal and wash), Wollen, William Barnes (1857-1936) / Bridgeman Images

USB1163002: John Buckle (d.1818), Catton, Charles, I (1728-98) / Bridgeman Images

ELC1190961: Apotheosis of the King of Rome (Apoteosi del re di Roma), by Giuseppe Bernardino Bison, 1811, 19th Century, oil on canvas, Bison, Giuseppe Bernardino (1762-1844) / Bridgeman Images

NAM5923415: English basket-hilted broadsword, 1610 circa (metal), English School, (17th century) / Bridgeman Images

USB1161217: The Card Players, Rombouts, Theodor (1597-1637) (after) / Bridgeman Images

XLA3761327: Le Morte Darthur - compiled by Thomas Malory, Flint, William Russell (1880-1969) / Bridgeman Images

KDC465794: The Honours of Scotland, Scottish Regalia, 1900 (colour litho) / Bridgeman Images

NAM5923416: English basket-hilted broadsword, 1610 circa (metal), English School, (17th century) / Bridgeman Images

NAM5924970: Buff coat worn by Major Thomas Sanders, 1640 circa (leather), English School, (17th century) / Bridgeman Images

XEE4135910: Illustration for Iconology or ideas from the sphere of passions and allegories, Vienna 1801 (engraving), Austrian School, (19th century) / Bridgeman Images

USB1161717: Lieutenant-General Richard Onslow (d.1760), Hysing, Hans (1678-1753) / Bridgeman Images

USB1157308: King Charles II (1630-1685), as a boy (after Van Dyck), Lucas, John Seymour (1849-1923) / Bridgeman Images

PFH1168550: Japan: Tomoe Gozen (1157-1247), a female samurai or onna-bugeisha known for her bravery and strength, Yosai, Kikushi (1788-1878) / Bridgeman Images

VAG6200032: Piazza Mercanti, Milan, Lombardy, Italy, October 2015 (photo) / Bridgeman Images

USB1162610: Harry Grey, 3rd Earl of Stamford (1685-1739), Richardson, Jonathan (1665-1745) / Bridgeman Images