The quote is attributed to the Roman poet Juvenal, who lived in the 1st and 2nd centuries AD. Juvenal wrote a series of satires that criticized the social and political problems of his time. He often wrote about the gap between the rich and the poor, and he argued for the importance of compassion and justice.
The phrase "When the poor have cried, Caesar hath wept" is a powerful reminder that even the most powerful people are capable of feeling empathy for others. It is also a reminder that we should all be concerned about the suffering of the less fortunate and do what we can to help them.