Roman Numerals in the Middle Ages in Europe.

 Roman Numerals in the Middle Ages in Europe. An Example.

Religious manuscripts frankly outnumber secular manuscripts but I wanted to use this image while I'm thinking about typography and number to remind people how long roman numerals persisted.

You may see numbers in modern "Gothic" fonts but until the Renaissance and beyond Roman numerals were still quite commonly used in inscriptions and paintings and illustrations. 

This may be partly because the basic maths text for many centuries was Euclids Elements in a LATIN translation yet ironic both Latin and Greek used an acrophonic system to write numbers.

And why when 10 starts with a D in both Latin and Greek we switched to the Roman practice of writing 10 as an X is a mystery when the Romans sensibly used C for Centum 100?