Touriga Nacional is a dark-skinned grape variety grown in Portugal's Douro wine region. It is known for being an important grape in the production of Port, and is blended with up to 80 other grape varieties to create a complex and unique flavor profile. Touriga Nacional is similar to France's Cabernet Sauvignon in terms of flavor and aging potential. The grape was widely planted before the phylloxera epidemic in the 1800s, but its low yields led to it being replaced with more productive varieties. Modern clones of Touriga Nacional have higher yields and improved viticultural techniques have made it more commercially viable.