Knight Errant

n. medieval knight moving from place to place in search of courageous and chivalrous adventures; person inclined to daring and quixotic conduct

A knight-errant (plural knights-errant) is a figure of medieval chivalric romance literature. "Errant" meaning wandering or roving, indicates how the knight-errant would typically wander the land in search of adventures to prove himself as a knight, such as in a pas d'Armes. The first known appearance of the term "knight-errant" was in the 14th century poem Sir Gawain and the Green Knight, where Sir Gawain arrives at the castle of Sir Bercilak de Haudesert after long journeys, and Sir Bercilak goes to welcome the "knygt erraunt."
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Noun
1. a wandering knight travelling in search of adventure
(hypernym) knight

(n.)
A wandering knight; a knight who traveled in search of adventures, for the purpose of exhibiting military skill, prowess, and generosity.
  

A knight who has gone to earn renown in wars, tournaments , jousts , or through adventures encountered in wandering travels. The knight errant was largely a figure of romance , but young knights in the middle ages did have a great need for such travels, since they stood to inherit nothing if they were a younger son. These knights formed themselves into small companies of knights who hired themselves out in wars or competed in tournaments to earn the ransoms available for captured knights. Using their winnings and their reputations, they might be able to attract the attention of a lady or of a noble lord and thus secure their future.