- San Marino is founded (301 AD)
- San Marino self-government established (1243)
- Cesare Borgia occupies San Marino (1503)
- Fabiano di Monte San Savino attempts to conquer San Marino (1543)
- Cardinal Giulio Alberoni invades San Marino (1739)
- Constitution of San Marino (1600)
- Abraham Lincoln becomes a citizen of San Marino (1861)
- Kingdom of Italy confirms San Marino independence (1862)
- Neutral in World War I (1914-1918)
- Britain bombs San Marino (1944)
- Sammarinese Communist Party (1921-1990)
- Fatti di Rovereta constitutional crisis (1957)
(This post includes any nation or civilization that occupied at least a portion of San Marino at some point. Unless specified otherwise, the dates correspond to when a nation or civilization existed, but do not necessarily correspond to occupation of San Marino.)
