That poem about the gentleman abroad... HELP!

Hi,

There is a short poem, or even just a two-verse epitaph where Byron writes about how a knight has no honor left to earn in his home country, should travel abroad to seek it.

I have read those lines probably five years ago, and I can't, at all, remember where they come from!:willy_nilly:

Can somebody help me out, please!

The thing is, I don't remember the correct phrasing, or I would long have found it. Could it be from Byron's "Cain"?

Thanks a lot,

Rafe