Skojec was a medieval central European unit of account as well as a unit of mass. It was also used as a unit of currency. 1 skojec was equal to 1/24 of a grzywna

Grzywna (unit)

The grzywna was a measure of weight, mainly for gold and silver, commonly used throughout medieval central Europe, in particular Poland, Bohemia and the Rus lands. Grzywna was also a unit of measure of a unit of exchange, and as such used as money. There were several different grzywnas such as the...

.

1 skojec = 30 pfennig

Pfennig

The Pfennig , plural Pfennige, is an old German coin or note, which existed from the 9th century until the introduction of the euro in 2002....

s

1 wiardunek

Wiardunek

The Wiardunek was a medieval central European unit of mass most widely used in Poland and Germany. Wiardunek was also used as a unit of account and as a such as money.As unit of mass:1 wiardunek = 1/4 grzywna1 wiardunek = 4 ounces...

 = 6 skojecs

1 skojec = 2 groschen

Groschen

Groschen was the name for a coin used in various German-speaking states as well as some non-German-speaking countries of Central Europe , the Danubian principalities...

The etymology of the word skojec derives from the word skot which in old Polish described cattle

Cattle

Cattle are the most common type of large domesticated ungulates. They are a prominent modern member of the subfamily Bovinae, are the most widespread species of the genus Bos, and are most commonly classified collectively as Bos primigenius...

; cattle were used as the reference unit of exchange since at least the time of ancient Greece

Ancient Greece

Ancient Greece is a civilization belonging to a period of Greek history that lasted from the Archaic period of the 8th to 6th centuries BC to the end of antiquity. Immediately following this period was the beginning of the Early Middle Ages and the Byzantine era. Included in Ancient Greece is the...

, as there are references in the Iliad

Iliad

The Iliad is an epic poem in dactylic hexameters, traditionally attributed to Homer. Set during the Trojan War, the ten-year siege of the city of Troy by a coalition of Greek states, it tells of the battles and events during the weeks of a quarrel between King Agamemnon and the warrior Achilles...

 to a suit of armor costing 9 oxen. Athenian lawgiver Draco, when establishing his laws in 621 BCE, defined all the fines in terms of how many cattle must be paid. The Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 word for money

Money

Money is any object or record that is generally accepted as payment for goods and services and repayment of debts in a given country or socio-economic context. The main functions of money are distinguished as: a medium of exchange; a unit of account; a store of value; and, occasionally in the past,...

, pecunia, is proof that Romans always saw cattle (pecus) as the source of wealth. In time, a slab of copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

with an imprint of an ox became equivalent to the worth of the animal. In India, the word rupia means both cattle and money. Similarly, in Poland skot meant cattle and its extension skojec described money.