AEIOU sequence

[-JKP-]

In the article that bi3mw linked, I noticed this, "Die Ritter führten das fünffache Jerusalemkreuz, das Friedrich dann zur Grundlage seines Monogramms machte."

Translation: The knights transported the five-part Jerusalem cross, that Frederick used as the basis for his Monogram.


I assume the author is referring to the emblem with the fence-like bars:




But I notice, the number five also comes up in relation to the five masses.

AEIOU is five vowels, so it fits with the theme of five, as well. Perhaps this, in part, inspired Frederick to select the vowels.