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Early Babylonian and Egyptian records and the Hebrew Bible say that length was first measured with the forearm, hand, or finger.

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The Babylonian's method of measuring was very slight longer than the Egyptian cubit.

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The Romans adapted the Greek system. The romans did not use cubit.

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In the 12th century, King Henry I fixed the yard as the distance from his nose to the thumb of his out-stretched arm.

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a royal ordinance Assize of Weights and Measures gave a long list of definitions of measurement to be used. It was rather successful and lasted 600 years.

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In the 14th century, King Edward II of England ruled that 1 inch equalled 3 grains of barley placed end to end lengthwise.

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Gabriel Mouton suggested that the world should adopt a uniform scale of measurement based on the mille, which he defined as the length of one minute of the Earth's arc.

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a new measurement system was adopted based on a length from nature.

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In 1791, France proposed the unit of the meter (which meanse measure in greek). The reference for the meter was the distance of the meridian from the north pole to the equator.

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Later in the late 19th century France a prototype meter using a mixture of platinum and iridium (resistant to oxidation and abrasion) was created for a need to unify dimension references on a global scale.

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In the 1860s Britain, the United States and the German states all made moves towards adopting the metric system

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In 1960 during the General Conference on Weights and Measures the length of one meter waas determined by the wavelength of orange light that came from the element Krypton-86 in a vacuum

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In 1983 the length of  one meter was determined by the speed of light and time and since then the meter has been defined as "the distance that light travels in a vacuum in 1/299,792,458 of a second,"