Rondinella is a red grape found in the northern part of Italy, in the Veneto region. It's usually blended with the Corvina grape. It is used to make Valpolicella and Bardolino wines.
Pedro Ximinez (PX) is a white grape found in Spain and is used to make sweet, dessert style Sherry. It's also found in Chile and Argentina where it's the most widely white grape there. It's also grown in Australia where it's used to make fortified wines. Originally found in the Canary Islands it was brought to Spain by a soldier named... Pedro Ximinez.
Tannat is a red grape found in the southwest part of France and it's also the most widely planted grape in Uruguay. It's also found in other countries in South America and experimented with in Virginia and is seeing increased plantings in California. In France it's usually blended with fuller bodied wines to soften it up and make it more drinkable. Tannat has raspberry overtones and can age well. In Uruguay it has more blackberry overtones and softer tannins with more elegance.