I did not know it was lost!
It is very important for the calculation of the area of a circle and such calculations were important to the ancient geometers (people who measured land/earth).
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The value of pi is found by dividing the circumference of a circle by its diameter and pi is an irrational number which means it can not be expressed as a fraction.
the founder of the longest pi is...
The numerical value of pi is often found using a Taylor or Maclaurin series (Taylor series centered at 0).
Since circumference is found by multiplying pi by the diameter of the circle, the diameter can by found using the inverse operation. diameter = circumference/pi
Pi had been found over 2,000 years before Einstein was born.