One of Ireland’s finest whiskeys, Tullamore Dew was first distilled in 1829 in the small town of Tullamore in County Offaly in the heart of Ireland. The name comes from the initials of an earlier owner, Daniel E. Williams – D.E.W.One of Ireland’s finest whiskeys, Tullamore Dew was first distilled in 1829 in the small town of Tullamore in County Offaly in the heart of Ireland. The name comes from the initials of an earlier owner, Daniel E. Williams – D.E.W.