Until 1649, when Christina was twenty-three, the Swedish royal art collection was unimpressive, with good tapestries but for paintings, little more than "about a hundred works by minor German, Flemish, and Swedish painters". But in May 1649 the fabulous loot from the occupation of Prague Castle the previous year arrived, with the pick of the collection amassed by the obsessive collector Rudolph II, Holy Roman Emperor (1552–1612), one of the most important in Europe. Rudolf's bulk purchases had included the famous collection of Emperor Charles V's leading minister Cardinal Granvelle (1517–86), which he had forced Granvelle's nephew and heir to sell to him. Granvelle had been the "greatest private collector of his time, the friend and patron of Titian and Leoni and many other artists",