[ANSTHRLD] Wherein Snorri Bangs his Head Against a Wall ...

[Jay Rudin]

> > Hmph.  Let's see what I can find...
> >
> >    Pierced per bend sinister.] We do not tierce of three colors in this
>
> <snip>.  Yup, that's all I found too.

You can have it; it's just not blazoned that way.  It has been established
since at least the 1980s that "paly of three X, Y and Z" is reblazoned as
"Per pale X and Z, a pale Y".  The major effects of this are that it adds
another layer, and affects tincture rules.  You can't have paly of three
gules, vert and azure, for instance, because that's a color bend on a color
field -- even though you intended it as just a color field.

If there's a specific precedent, it is from Ioseph of Locksley or earlier.

Robin of Gilwell / Jay Rudin
The Wizard of Arms