# How to flat and sharp a chord in roman numeral notation?

When you see a flat or a sharp before a roman numeral do you just flat the first note?

so in the key of C major:

III is: E G# B
bIII is: Eb G# B (do I just flatten the first note?)

iii is: E G B
biii is: Eb G B
biii dim is: Eb Gb A

I think dim makes the entire chord diminished based on the first note.

v is: G Bb D
#v is: G# Bb D
#v dim is: G# B D

Does this look right?

• III is E G# B, but usually it's V/vi. bIII is Eb G Bb. v is G Bb D - perhaps you meant V (G B D)? biii is Eb Gb Bb. The whole question needs a revamp!
– Tim
Commented Jun 2, 2019 at 15:02
– Andy
Commented Jun 2, 2019 at 15:20
• @Tim sorry had typo I edited it.
– user34288
Commented Jun 2, 2019 at 16:05
• Needs another edit...
– Tim
Commented Jun 2, 2019 at 16:36
• @Tim if you mean bIII is Eb G Bb that was the whole crux of the question. I was wrong when I assumed flatting is just for the first note. If I change that then there wouldn't be much of a question.
– user34288
Commented Jun 2, 2019 at 16:48