when and how was the linear measurment of one foot standardized to 12 inches?

The foot as a measure was used in almost all ancient cultures and was usually divided into 12 inches. The first known standard foot measure was from Sumer (now southeastern Iraq), where a definition is given in a statue of Gudea of Lagash from around 2575 BC.

It seems likely that at least since about the 12th century AD, the precise length of a foot was based on the inch, not the other way around.

Originally, the Imperial system of Measurement was based on that used in the Roman Empire, and during that time, all were standardized. After the collapse of the Empire, the definitions of the measurements began to wander a bit until by the 18th C, they were completely different in different countrys and often different in separate regions of the same country.

Such was the situation in France at the time of the Revolution, and it was the need for a new standard that brought about the introduction of the Metric System. Eventually other countries adopted this new standard as well. It should be noted that in the century since its adoption, the length of the meter has been redefined a number of times until a standard that was based on a real figure could be rationalized

The length of a man's foot. A measure of length. From town to town, country to country, this measurement could differ, but as a rule a French Pied was equal to 12.8 English inches, while a Spanish Pie was 10.96 English inches

Inch From the Latin "Uncia" (or a twelfth part), an inch is 1/12 Foot. A measure of length. In French, the unit of 1/12 a "foot" is the Pounce.

English inches are also defined as being the length of "Three good sized barleycorns placed end to end".

Have fun with that LOL

The modern unit of length, the foot, was not standardized internationally until 1958. However, the oldest known standard foot existed in Sumeria in 2575 BC. From its inception, the foot was almost always subdivided into 12 (or rarely 10) inches, which were meant to be equivalent to the width of the thumb. The word inch comes from the Latin "uncia," meaning "one twelfth."

The modern unit of length, the foot, was not standardized internationally until 1958. However, the oldest known standard foot existed in Sumeria in 2575 BC. From its inception, the foot was almost always subdivided into 12 (or rarely 10) inches, which were meant to be equivalent to the width of the thumb. The word inch comes from the Latin "uncia," meaning "one twelfth."