|Burney 212 f. 14|
The speculation given to me years ago was that as the calligraphy was typically immaculate on this style, and there was little illumination, so it was possible that many illuminators died in the plague, giving birth to this style. A pretty bit of storytelling, but the dates don't quite line up with this sad tale, as the above example is from Valerius Maximus's Facta et dicta memorabilia, c. 1471. The Black Death peaked in Europe between 1348 and 1350, killing between 75 million and 200 million people.
Whatever its true history, I find this style to be elegant and both complex and simple in one fell swoop. Aryanhwy's index is a great tool for scribes to create versals, and you can bet I'll be using it in the future. Thank you for this great tool and resource!