1616

William Harvey discovered blood circulation

1900

Karl Landsteiner, an Austrian biologist, discovered the three blood groups - A, B and C, later named O

1940

Landsteiner and Weiner discovered the Rh system

1818

James Blundell, an English Obstetrician, attempted the first human to human blood transfusion

1902

Decastello and Sturli, Dr Landsteiner's colleagues, discovered the blood type AB