Definition of "piatza"

Sometimes 5 Imprimaturs are ſeen together dialogue-wiſe in the Piatza of one Title page, complementing and ducking each other with their ſhav'n reverences

1644, John Milton, Areopagitica; a Speech of Mr. John Milton for the Liberty of Unlicenc’d Printing, to the Parlament of England, London: [s.n.], page 8

Piatza = market-place, meeting-place [...] Shakspere seems to use place in this sense in The Taming of the Shrew, i. I. 'Padua, a public place '

1874, John Milton, edited by J. W. Hales, Milton Areopagitica Edited With Introduction and Notes‎, Oxford: Clarendon Press, Notes, page 84

The Indian tribes in Guiana have mystery-men, called Piatzas, or Piaies, who constitute a powerful priesthood.

1876, Carl Engel, “Music and Medicine”, in Musical Myths and Facts‎, volume II, London: Novello, Ewer & Co., […], pages 89–90