The modern planned town – reminiscent of Plantation towns with its characteristic wide main street and with long, narrow individual gardens to the rear and out of sight – dates from c. 1830. The modern town was largely laid out under the direction of Andrew Blayney, 11th Baron Blayney (1770–1834), who inherited the family peerage and the large Blayney Estate as an adolescent in 1784. By about 1800 the then young Lord Blayney had ordered and implemented major reforms in Castleblayney, greatly improving the prosperity and appearance of the town. Educated in France and Germany, the 11th Lord Blayney is famous for his distinguished military career, eventually rising to the rank of Lieutenant-General, having served in the West Indies, South America, southern Africa and the Napoleonic Wars as commander of the 89th Foot, popularly known as 'Blayney's Bloodhounds'. As a peer, he was very active in the suppression of the revolt of the United Irishmen in 1798.