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John Bury has also written a little about how this Brazilian church is "Borrominesque," but he can't seem to pinpoint any concrete influence.1 So far, I haven't been able to find a concrete influence for N. S. do Rosário dos Pretos either. One interesting thing I have found, though, is that this church might have been indirectly influenced by the Peterskirke in Vienna.2 Some Portuguese rulers and leaders (i.e. Pedro II, João V, and the Marquis do Pombal) were married to Austrian ladies. Perhaps the Austrian design trickled through Portugal and then down to Brazil.
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Anyhow, I hope that I can do more research and find out the connections between Borromini, the Peterskirche, and N.S. do Rosário dos Pretos. If anyone has leads, suggestion, or information, I'd be happy to hear them.
1 John Bury, "The 'Borrominesque' Churches in Colonial Brazil," (The Art Bulletin 31, no. 1):43- 44.
2 Murillo Marx, "Brazilian Architecture in the XVIII and Early XIX Centuries," in History of South American Colonial Art and Architecture by Murillo Marx and Damián Bayón, eds., (New York: Rizzoli, 1989), 361. Marx also cites Pal Kelemen, Baroque and Rococo in Latin America (New York: Macmillan, 1951).
3 I do recognize, though, that the Wikipedia article could be referring to some aspect design other than the floorplan. In general, though, I have not observed any other striking similarities between the designs of Peterskirche and St. Peter's Basilica. If anyone knows specific architectural connections between the two buildings, I would be interested to know them.