White Horse blended scotch is traditional scotch first produced in 1890 by Peter Mackie. It is a blend of 40 different scotches and recognized as one of the more intriguing and flavorful blends on the market. It is said to be named after an inn in Edinburgh, Scotland. Various whisky reviews note the presence of Lagavulin Islay single malt at the heart of the blend.
The label used to be owned by United Distillers and Vintners, which become involved in a series of merges that ultimately turned in to Diageo, who now owns the label.