Many flags that are used for societies that either didn't use flags, or where there are no known flags we can find from the era, use more modern flags or even made up flags using symbols from the group in question .
One flag = one state or even people, was not a thing everywhere (and in 1444 it wasn't always a thing in Europe even). If something better comes along we replace them but in many cases there just isn't any flag to find
One flag = one state or even people, was not a thing everywhere (and in 1444 it wasn't always a thing in Europe even). If something better comes along we replace them but in many cases there just isn't any flag to find