Therewith vs Thereon - What's the difference?

As adverbs the difference between therewith and thereon

is that therewith is with this, that or those while thereon is on that.

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With this, that or those.

ca. 1370:' He ?aue ?ow fyue wittes//For to wershepen hym '''ther-with - '' , ii-16

I have learned, in whatever state I am, therewith to be content. - Philippians , 4:11

In addition to that; besides, moreover.

To speak of strength and therewith hardiness. -

Thereupon, forthwith; with that being said or done.

1869:' 'I take the privilege, Mistress Ruth, of saluting you.' ...And '''therewith I bussed her well. - , ''Lorna Doone , 1.

(-)

on that.