Baron Baltimore, of Baltimore Manor in County Longford, was a title in the Peerage of Ireland. It was created in 1624 for George Calvert and became extinct on the death of the sixth Baron in 1771. The title was held by several members of the Calvert family who were proprietors of the palatinates Avalon in Newfoundland and Maryland (later the U.S. state of Maryland). In the context of United States history, the name Lord Baltimore usually refers to Cecil Calvert, 2nd Baron Baltimore after whom the city of Baltimore, Maryland, is named. His younger brother Leonard Calvert was the first Governor of Maryland.