Daniel O'Connell (1775-1847) was an Irish political leader known for his efforts to achieve Catholic emancipation in Ireland. He played a crucial role in advocating for the rights of Catholics, who faced discrimination and restrictions under British rule. O'Connell founded the Catholic Association in 1823, which mobilized public support and led to the repeal of many oppressive laws. O'Connell was also a prominent figure in the movement for Irish self-governance. He organized mass rallies and used peaceful protest to demand reforms. His efforts culminated in the Reform Act of 1832, which expanded voting rights and improved representation for the Irish people.