It is a very famous saying, that Julius Caesar said at the battle of Zela in 48bc.
It means ‘I came, I saw I conquered’. It refers to the swiftness that his army overcame the army of Pharnaces.
Gaius Julius Caesar was a Roman statesman and general, who was noted as the author of Latin prose. He played a key part in the historic events that led to the fall of the Roman Republic and the start of the Roman Empire.