Robertus Keuchenius

Portrait of Frederick Spanheim II Robertus Keuchenius

Illustration of Scientist Robert Koch Working in Laboratory Anonymous

Gustav Robert Kirchhoff Anonymous

Portrait of Robert Junius Arnoldus Montanus

Robert the Bruce. Robert I (1274 – 1329) Anonymous

Mucius Scaevola before Porsenna, 1630s. Peter Paul Rubens

Thales of Miletus Nicolaes de Clerck

Robert Koch Anonymous

Robert Koch (1843-1910). Engraving. Colored. Anonymous

Mucius Scaevola before Porsenna, 1533 Anonymous

Letter from Caleb Cheeshahteaumauk to Robert Boyle Caleb Cheeshahteaumauk

Plate with portrait preacher Robertus Junius Anonymous

Friedrich August Kekule von Stradonitz, German organic chemist, c1885 Unknown

Engraving of Robert Koch in his Laboratory Anonymous

The Marriages of Constantine and Fausta and of Constantia and Licinius Peter Paul Rubens

Portrait of Casparus Keidtwerdius Joannes Meyssens

Rhacodactylus ciliatus (eyelash gecko) Anonymous

Cecrops' Daughters Finding Erichtonius, c.1632 Peter Paul Rubens

Gustav Robert Kirchhoff, German physicist, 1873 Unknown

Robert Estienne French School

Portrait of Peter Bortius, Reynier Blokhuysen J.D.F. Alphenus

The Finding of Erichthonius, 1632-33 Peter Paul Rubens

Robert Bunsen, German chemist, 1850s C Cook

Robert Wilhelm Bunsen, 19th century German chemist Anonymous

The Company of Captain Allaert Cloeck and of Lieutenant Lucas Jacobsz. Rotgans, Amsterdam, 1632 Thomas de Keyser

Portrait Engraving of Robert Mills Anonymous

Gustav Kirchhoff, Robert Bunsen and Henry Roscoe, scientists, c1860 Unknown

Tiberius Wearing Overlapping Robe Anonymous

Cechenus pyrenaeus (ground beetle) Anonymous

Gustav Robert Kirchhoff, German physicist, 1876 Unknown

The Togatus Barberini Anonymous

Portrait of Poet Robert Burns Anonymous

Lucius Cassius Dio Cocceianus Anonymous

Gnaeus Pompeius Magnus Anonymous

Robert Smythe Hichens, English journalist and novelist RA Reaks

The Death of Decius Mus, 1616-1617 Anonymous