"There can only be one" quest requires me to show five qualities. Wiki states that on completing the "Warble of a smitten knight" quest one must do the final tournament and win. Unfortunately I did not participate and it is now too late to go back.
Has anyone discovered another way of proving their "valor"?

Compassion: Be nice to people; help people in trouble.

Generosity: Take jobs but don't haggle over price; when available, give money or tips.

Honour: Refuse rewards; don't take bribes; keep your word.

Valour: Take any opportunity to face tough enemies.

Widsom: Take any opportunity to find peaceful resolutions to problems.

There is a point in the game where two mucus Linge happen when you defeat them you ought to probably have processed the point Valour. Was for me at least that.

I tjink in itself, there are many places in the game where you can even free play, but it is free to play as soon as possible makes sense that you also fully can use ensure the best of the weapon.

I hope you can understand this I used google translator.

Go to Beauclair and talk to Jacquette who is standing outside, near to the Nilfgaardian embassy. This will initiate the quest 'Feet as Cold as Ice', which will give you the valour requirement.

Thank you. Will give it a try.

UPDATE: Spent about an hour looking for this embassy. There are no sign boards off cource, indicating where it is located.
Viewing a video, I drew a sketch of the river and jetty from the mini map as viewed from the balcony where I met Jacquette
and this helped me locate its location. I have the quest but it is a number of levels higher than my current level.