The Tournament Prize Is a Wedding

Premise

You might be strong but you're not rich. You couldn't pay for your inn and got kicked out. But to your surprise, there's a rumor that whoever wins an open tournament will be richly rewarded by the Emperor of your kingdom. You set out after hearing the rumor, not knowing what the real reward was... The prize is marrying the kingdom's princess, the Emperor's daughter.

You defeated every warrior in your battle and won the tournament with ease.