Charles FitzGerald, 4th Duke of Leinster (1800-1874), was an Irish nobleman known for his significant role in the political and social landscape of 19th-century Ireland. He inherited the title from his father, the 3rd Duke, and was a prominent figure in the Whig Party, advocating for various reforms during his lifetime. The 4th Duke was also a notable landowner, managing vast estates in County Kildare and County Carlow. His contributions to agriculture and local development were recognized, and he was involved in various charitable activities, reflecting his commitment to improving the lives of his tenants and the broader community.