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Roman Measurements

Roman Money
The Uncia formed the basis of the early Roman currency, as Rome gradually emerged from a bartering economy. It was the twelfth of a Roman pound of bronze, hence it was a 'Roman ounce'.
The smaller denominations of coins only played a part in the early part of the empire and later became obsolete with inflation.
Under Augustus the base metal coinage appeared to change from bronze to brass.
Other coinages existed at various times, but these below appear as the major Roman coins.
=1 unciabronze/brass
2 unciae=1 sextansbronze/brass
3 unciae=1 quadransbronze/brass
2 quadrantes=1 semisbronze/brass
6 sextantes=1 asbronze/brass
4 quadrantes=1 asbronze/brass
2 semisses=1 asbronze/brass
2 asses=1 Dupondiusbrass
2 Dupondii=1 Sestertiusbrass
4 Sestertii=1 Denariussilver
2 Denarii=1 Antonianussilverintroduced by Caracalla
2 Denarii=1 Follisbronzeintroduced by Diocletian instead of the Antonianus
25 Denarii=1 Aureusgold
60 Aurei=1 Roman pound of gold (326 gram)
=1 Siliquasilverintroduced by Anastasius
24 Siliquae=1 Solidus (bezant)goldintroduced by Constantine
72 Solidi=1 Roman pound of gold (326 gram)
Roman Length Measurements
=1 uncia=24.6 mm/0.97 inchRoman inch
12 unciae=1 pes=295.7 mm/11.6 inchesRoman foot
1.5 pedes=1 cubitum=
2.5 pedes=1 gradus=
2 gradus=1 passus=1.48 m/1.62 yardsRoman pace
125 passus=1 stadium=
1000 passus=1 mille (mille passus)=1480 m/1618 yardsRoman mile
Roman Area Measurements
The basis of Roman agricultural area measurements was the iugerium which was approximately 3000 square yards, and was what the standard area a pair of oxen were believed to be able to plow in one day. In fact the word iugerium means 'yoke'.
=1 iugerium
2 iugeria=1 heredium
100 heredia=1 centuria
Roman Liquid Measurements
The standard unit in liquid measurements was the sextarius, which was about the equivalent of one English pint (0.568 litre).
4 quartarii=1 sextarius
6 sextarii=1 congius
4 congii=1 urna
2 urnae=1 amphora
Roman Months
The early agricultural Roman society started its year in March and hence saw this as the first month of the year. The cold winter months simply didn't have a name, as they were 'dead' months for which no planning was required. Only with further advancement, were names introduced for the winter months.
January=Januariusnamed after Janus, god of gateways
February=Februariusnamed after 'februare' which means 'to purify'
March=Martiusnamed after Mars, the god of war
April=Aprilisnamed after 'aperire' which means to 'open' and which refers to the opening of flowers
May=Maiusnamed after Maia, goddess of summer
June=Juniusnamed after Juno, queen of the gods
July=Juliusnamed after Julius Caesar (the month of his birth), previously called Quinctilis
August=Augustusnamed in honour of emperor Augustus, previously called Sextilis
September=Septemberthe seventh month
October=Octoberthe eighth month
November=Novemberthe ninth month
December=Decemberthe tenth month
Roman Numerals
X-thousand-2.gif - 274 Bytes=written with a bar above them, numbers are multiplied by 1'000=10'000
X-hundredth-2.gif - 273 Bytes=written with a bar with tails above them, numbers are multiplied by 100'000=1'000'000