Context: According to heraldic sources total number of legal ennoblements issued between the 14th century and the mid-18th century, is estimated at approximately 800. This is an average of only about two ennoblements per year or only 0.000 000 14 – 0.000 001 of historical population. Compare: historical demography of Poland.

Question: Around what time was the total legal number of ennoblement at 800?
Answer: between the 14th century and the mid-18th century,

Question: What is average for ennoblements between 14th and min 18th century.
Answer: two ennoblements per year

Question: What type of sources give information regarding total number of enablements?
Answer: heraldic sources