[split] EVA-y as Latin "-us" etc.

[Juan_Sali]

There was a lot of debate on the question of EVA-y (9-like glyph in the VM). While it is true that such letter was definitely used for Latin abbreviation cum/con at the beginning, and us/um at the end, it is also true that in the non-Latin writing, that same glyph often stood for the letter i/y. I suppose when the Latin ending ending -us was dropped in the Italian language, they began to read the names of the saints with the ending -i, not -us. I have noticed such two way spelling in many 15th century calendar Housebooks and even in the bibles that contained the names of the saints.

I am interested in the use of 9 as i/Y. Do you know with more precision when and where its use started?