The Cologne Mark was a unit of weight equivalent to 233.856 gram

Gram

The gram is a metric system unit of mass....

s. It was introduced by the Danish King Hans in the late 15th century and was used as a standard for weighing metals. It came to be used as the base unit for a number of currency standards, including the Lübeck monetary system, which was important in northern Europe in the late Middle Ages

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

, and the coinage systems of the Holy Roman Empire

Holy Roman Empire

The Holy Roman Empire was a realm that existed from 962 to 1806 in Central Europe.It was ruled by the Holy Roman Emperor. Its character changed during the Middle Ages and the Early Modern period, when the power of the emperor gradually weakened in favour of the princes...

, most significantly the conventionsthaler

Conventionsthaler

The Conventionstaler was a standard silver coin of the Holy Roman Empire. It was introduced in 1754 and contained one tenth of a Cologne mark of silver ....

, which was defined as one tenth of a Cologne Mark.

The Mark was defined as half a Pfund (pound) with 16 Unze (ounce

Ounce

The ounce is a unit of mass with several definitions, the most commonly used of which are equal to approximately 28 grams. The ounce is used in a number of different systems, including various systems of mass that form part of the imperial and United States customary systems...

s) to the Pfund. The Unze was subdivided into 2 Lot, 8 Quentchen, 32 Pfennig or 36 Gran, with the Gran equal to 0.812 grams.