A nobleman like Robin of Locksley? No. Noblemen served in the Crusades either as part of their feudal obligations to their liege lords or as volunteers. And the vast majority of commoners in Crusader armies were professional soldiers or volunteers too.
On a separate topic, it pisses me off how working-class figure of resistance Robin Hood got turned into nobleman savior and good king loyalist Robin of Locksley. The Richard Lionheart loyalist stuff was added in the 16th century, and the nobleman thing didn’t come in until practically the 17th century.
The O.G Robin Hood was an anti-monarchical yeoman.