The concept of IQ (intelligence quotient) as we understand it today was developed in the early 20th century. The first standardized IQ tests were created by Alfred Binet and Theodore Simon in 1905. Therefore, we don't have records of IQ scores for individuals who lived before this time.
IQ is typically measured on a scale with a mean of 100 and a standard deviation of 15 or 16 points. This means that around 68% of the population falls within the range of 85 to 115. Below 70 is often used as a cutoff for intellectual disability, which is characterized by significant limitations in intellectual functioning and adaptive behavior.
It's essential to remember that IQ is just one measure of intelligence and cognitive abilities, and it does not capture the full spectrum of human intelligence, creativity, and capabilities. Moreover, using IQ as the sole measure of a person's worth or potential is inappropriate and reductionist.
If you are interested in learning about exceptional individuals with low IQ scores, there have been cases of individuals with extremely low IQs who have achieved remarkable things in various aspects of life. However, the focus should be on providing support, understanding, and opportunities for individuals with different cognitive abilities, rather than defining their potential based solely on IQ scores.