One of the oldest extant homes in the Sumner Hill neighborhood of Jamaica Plain is this stunning 1852 country mansion, built for William Hyslop Sumner. General William H. Sumner (1780-1861) was born in Roxbury, not far from where he built this house in his later years of life. He attended Harvard College, and after graduating, Sumner entered the law office of district attorney John Davis, gaining admittance to the bar in 1802. He practiced law from 1802 until 1818 when he left the field in order to concentrate on his military duties at the outbreak of the War of 1812. Sumner was involved in the state’s defenses. In September 1814 Massachusetts Governor Caleb Strong sent Sumner, then a lieutenant colonel in the state militia, to coordinate the defense of Portland in the District of Maine (which was then still a part of Massachusetts). His task was to maintain 1,900 militia and create a better relationship between the Massachusetts militia and the U.S. Army forces posted there. After the war, he developed what we know today as East Boston. His maternal grandmother, Mehitable (Stoddard) Hyslop, owned Noddle’s Island. Sumner’s Beginning in 1833, in partnership with Stephen White and Francis J. Oliver, The East Boston Company was created to conduct the development of East Boston. They laid out the first planned neighborhood in the City of Boston, laying out grids and house lots. He would go on to write histories on the neighborhood which are referenced to this day. His country estate in Jamaica Plain is a blending of Greek Revival and Italianate styles. The home is undergoing a renovation currently.