As late work he built masterful Renaissance building, which are considered his masterpieces : the Town Hall in Altenburg and the so-called New buildings in Weimar, the Grünes Schloß (now the “Duchess Anna Amalia Library” ) and the Französischen Bau of the Veste Heldburg ( today : German Castle Museum under construction) .
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1560-1564 expansion of the Veste Heldburg, construction of the French building of the fortress in the Heldburg(gotta fire in 1982, faithful to the original reconstruction since 1990, 2013: restored; furnishings with the Deutsches Burgenmuseum (German Castle Museum), Opening: 2015) and construction of the 114 meter deep castle well
Johann Friedrich the Middle had it reconstructed in 1560 by his court architect Nikolaus Gromann in the style of the Renaissance (it was originally called the “Neuer Bau”, but today is known as the “Französischer Bau”) and removed the ducal residence.
Nikolaus Pevsner | Nikolaus Harnoncourt | Nikolaus Riehl | Nikolaus Joseph von Jacquin | Johann Nikolaus Forkel | Nikolaus Simrock | Nikolaus Frank | Prince Nikolaus of Liechtenstein | Nikolaus Selnecker | Nikolaus Meyer-Landrut | Nikolaus Gromann | Nikolaus Glockendon | Nikolaus Geyrhalter | Nikolaus Gerhaert | Nikolaus Federmann | Nikolaus Berlakovich | Johann Nikolaus Hanff | Duke ''Christian'' Nikolaus Udo Peter of Oldenburg | Dietrich Nikolaus Winkel |