(I forgot the Magna Carta
The song is "In My Life" by the Beatles, the molecule is caffeine, the constellation on the right is Orion, on the upper middle (two stars) is Canis Minor, on the lower middle is one I made up to fill space. The Greek is Archimedes's (probably apocryphal) last words. The statement in black on the lower right is the second fundamental theorem of calculus. The gold number on the bottom is the speed of light. The circle is the unit circle. The chemical phrase above the Greek is photosynthesis. The ribbon is in support of gay rights.
It's really busy/not particularly pretty, but I was (mortar)bored.
Dates: Alexander the Great, Jesus (roughly), fall of the Han, fall of the Romans (officially), Great Schism, Normans invade England, Columbus, Luther's 95 Theses, Jamestown, Glorious Revolution, American Revolution/Smith's Wealth of Nations published, French Revolution, Marx's Communist Manifesto published, American Civil War, European Revolutions, Chinese Revolution, WWI begins, Russian Revolution, Atomic bomb/WWII ends, Chinese Communist Revolution (implicit beginning of the Cold War), Berlin falls, the year all the cool kids graduate