a. Rather than a 4, to me it looks like a pen slip so that it would read "...e uno certo fratello dela bayla...". If you look at the third line, you'll see 1493 with a contemporary "4" with a descender, so it's unlikely the one you noted (with no descender) is a "4".
b. It's a bit difficult to see from the handwriting whether it's intorum, nitorum or uitorum (or vitorum) but in that context, the "4" shape is usually the Latin -rum suffix. Given the context of the statements about emperor Otto, I'm guessing it's intorum.
c. I'm really not sure of the third one since if it means "quarto" the "o" is usually written smaller (and often superscripted) and this one is followed by "r" which is a combination I don't recognize. The "o" can also sometimes be an abbreviation for "modo" depending on context but I don't think I've seen it paired with a "4".
When you post snippets of text, it helps to get a slightly wider shot, so we can see how the scribe writes a variety of letters and uses the other abbreviations. Some scribes had very individual ways of abbreviating (sometimes nonstandard) but they were typically somewhat consistent over the course of a couple of pages. So is there a chance we can get a wider shot of that third one (a shot that includes the letter "p"). I'm not certain what you designated as "per" is per without seeing more of the handwriting. It could be "pro" or a flourished abbreviation for something else.
b. It's a bit difficult to see from the handwriting whether it's intorum, nitorum or uitorum (or vitorum) but in that context, the "4" shape is usually the Latin -rum suffix. Given the context of the statements about emperor Otto, I'm guessing it's intorum.
c. I'm really not sure of the third one since if it means "quarto" the "o" is usually written smaller (and often superscripted) and this one is followed by "r" which is a combination I don't recognize. The "o" can also sometimes be an abbreviation for "modo" depending on context but I don't think I've seen it paired with a "4".
When you post snippets of text, it helps to get a slightly wider shot, so we can see how the scribe writes a variety of letters and uses the other abbreviations. Some scribes had very individual ways of abbreviating (sometimes nonstandard) but they were typically somewhat consistent over the course of a couple of pages. So is there a chance we can get a wider shot of that third one (a shot that includes the letter "p"). I'm not certain what you designated as "per" is per without seeing more of the handwriting. It could be "pro" or a flourished abbreviation for something else.