In Italy in the Middle Ages, a unit of land area, = 1600 square staioli, about 2640.6 square meters. Also called petia. It is best understood through decomposition (after Kidson):

An ordine was a strip of land 10 staioli by 1 staiolo, thus = 10 square staioli.

Ten ordini made a catena, a square containing 100 square staioli.

Four catene made a quarta, a square containing 400 square staioli.

Four quarta made a pezza, a square containing 1600 square staioli.


Doursther (1840, pages 400, 505) says the stajolo then in use in Rome = ¹⁄₁₀ catena (the measure of length) = ¹⁄₁₀₀ catena (the measure of area), and the pezzo = 16 catenas = 1600 square stajoli, about 2640.7 square meters.

Peter Kidson.
A Metrological Investigation.
Journal of the Warburg and Courtauld Institutes, vol. 53 (1990).

Page 95.

Luco Paetus.
De mensuris et ponderibus Romanis et Graecis, cum his quae hodie Romae sunt collatis libri Quinque.
Venice: P. Manutius, 1573.


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