Mediterranean Hegemon of Ancient Greece - I'm not sure if Davos becomes a noble though. The Story Of A Low-Rank Soldier Becoming A Monarch - It's a webtoon that has a striking resemblance to I am the Monarch. Altina the Sword Princess - Regis, a military soldier(strategist) and one of the protagonists, was knighted. It's been so long since I've read it, so I'm not sure if Knight is a rank of nobility in the story. Monarch of Evernight Goblin Kingdom
Black Iron Glory Tales of Reincarnated Lord(already noble but lead wars) Fantasy Simulator (in one of simulations)
Fantasy Simulator is a good read at the start but it slowly starting to become drag as we go on but overall its 4/5 star