Vega Sicilia is Spain's most well known and prestigious estate. Located in the northerly region of Ribera del Duero, Vega Sicilia produces three wines, primarily from the local Tinto Fino (Tempranillo) grape. The estate was founded in 1864 by Don Eloy Lecanda y Chaves who brought vine cuttings from Bordeaux of Cabernet Sauvignon, Malbec and Merlot grapes to plant alongside Tinto Fino. Vega Sicilia's 3 cuvees include their flagship "Unico", a multi-vintage blend called "Reserva Especial", and younger style Valbuena.

Depending on the vintage, Unico is made from a blend of 80% Tempranillo with the balance of Cabernet Sauvignon and Merlot. Traditionally the wine is aged for ten years in barrel before its release. The Reserva Especial a blend of top vintages, while the Valbuena is made from younger vines and aged after five years' aging. Previously a Valbuena cuvee with three years of aging was produced until 1998, but has been discontinued.

Vega Sicilia gained its fame from its low harvest yields and long ageing period. The complexity that develops as the wine matures can be quite amazing, reflecting a tradition of immaculate winemaking. The winery has enjoyed an impressive reputation ever since 1903 when the estate, led by Antonio Herrero, won many awards and attracted international attention. Since 1982, the current owners are the Alvarez family which annexed the nearby Alion estate and acquired the Hungarian Tokay estate Oremus.