In his critical exhibition catalogue of Early Flemish Masters in Bruges in 1902, the Ghent great connoisseur of early Flemish Art and art historian Georges Hulin de Loo, came to the conclusion that Isenbrandt was actually the anonymous Master of the Seven Sorrows of the Virgin and the author of a large body of paintings previously attributed to Gerard David and Jan Mostaert by the German art historian Gustav Friedrich Waagen.
Purchases continued throughout the 19th century, with 345 works acquired during the inaugural directorship of Gustav Friedrich Waagen from 1830-1868, though paintings competed with antiquities for rather reduced purchasing budgets.
A pamphlet on the brothers Van Eyck led in 1832 to his appointment to the directorship of the newly founded Berlin Museum, now vastly expanded as the Berlin State Museums, although his main interest was the paintings in what is now the Gemäldegalerie, Berlin.
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Among his other publications are some essays on Rubens, Mantegna and Signorelli; Kunstwerke und Künstler in Deutschland; and Die vornehmsten Kunstdenkmäler in Wien.
Friedrich Nietzsche | Gustav Mahler | Friedrich Schiller | Gustav Klimt | Friedrich Engels | Gustav Holst | Gustav III of Sweden | Carl Friedrich Gauss | Karl Friedrich Schinkel | Gustav I of Sweden | Friedrich Dürrenmatt | Gustav Meyrink | Friedrich Hayek | Caspar David Friedrich | Georg Wilhelm Friedrich Hegel | Friedrich Hölderlin | Friedrich Gustav Jakob Henle | Friedrich Ebert | Friedrich Wilhelm Joseph Schelling | Karl Wilhelm Friedrich Schlegel | Gustav Stresemann | Friedrich Gulda | Gustav Noske | Friedrich Rückert | Friedrich Paulus | Johann Friedrich Böttger | Gustav III | Gustav, Hereditary Prince of Sayn-Wittgenstein-Berleburg | Gustav Fischer | Friedrich von Huene |