A debased style, which succeeded the revival of Italian architecture, and very prevalent in Germany. The ornamentation is without principle or taste, and may be designated ornamental design run mad. The Rock-temple of Ellora, in India, is most lavishly decorated.
“The sacristy of St. Lorenzo ... was the beginning of that wonderful
mixture of antique regularity with the capricious bizarrerie of modern
times, the last barren fruit of which was
the rococo.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Rococo Architecture from Fact Monster: