Thursday, May 1, 2025

Roger S. Bagnall on Weights and Measurements in the Roman Period

 Weight

 

The Greek weight system was based on the drachmê, or drachma, a term also used for coins of this weight. In the Roman period, the drachma was treated as 1/96 of the Roman pound (about 323 g), or about 3.36 g (table 8.5). But different Greek cities and other regions of the Greek world had their own weight standards, and one always needs to know what standard is in use in order to interpret figures in the texts. In general in the papyri one can presume that the drachma as a weight refers to the Ptolemaic standard (see the following section), which is close to but a bit higher than the figure given above. In Egyptian texts the drachma was reckoned as half of a qd (Copt. kite) and thus 1/20 of the dbn, which equated to 20 drachmas. In the Greek system of weights (described in the next section), the drachma was a subdivision in a system that included the mna and the talent, both also accounting terms for money. (For weights in jewelry see Ogden 1996.)

 

Table 8.5. Weights and Currency

8 chalkoi = 1 obol

6 obols = 1 drachma

2 drachmas = 1 qd (kite)

4 drachmas = 2 qd = 1 stater (tetradrachm) = 1 denarius

20 drachmas = 10 qd = 1 dbn

100 drachmas = 50 qd = 5 dbn = 1 mna

6000 drachmas = 3000 qd = 300 dbn = 1500 denarii = 60 mnai = 1 talent (Eg. krkr)

1 gold “quarter” (tetartê) = ½ drachma (a quarter of a didrachm or qd)

1 gold mnaieion = 8 drachmas (weight) = 16 “quarters”

1 Roman pound (litra) = 12 ounces (ounkiai) = 288 Roman grams (grammata) = 323 g

1 solidus (Diocletian to Constantine) = 1/60 pound = 4.8 grammata

1 solidus (post-Constantine) = 1/72 pound = 4 grammata = 24 carats

 

The Roman pound also had its own system of subdivisions and consisted of 12 unciae (Gk. ounkiai), or ounces, and grams (Gk. grammata), at 24 grams to the ounce. Thus 288 grams constituted a pound. (Roger S. Bagnall, “Practical Help: Chronology, Geography, Measures, Currency, Names, Prosopography, and Technical Vocabulary,” in The Oxford Handbook of Papyrology, ed. Roger S. Bagnall [Oxford: Oxford University Press, 2009], 188-89)

 

 

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