Chivalry first came to be known in the medieval ages thanks to Knights. It was referred to the title of the medieval institution of knighthood and the values/ideals of; knightly virtues, honour and courtly love. It was assimilated by some as being a warriors code, which was tweaked by the church in later years. The word itself actually comes from the French word chevalier, which means Knight in the English language. Eventually, the word came to have and aristocratic connotation: distinguishing a wealthy knight on horseback from a peasant etc. Knights in war were referred to as chivalrous if they were brave in battle, loyal to his king and God and if he was willing to sacrifice his life for the good of his defence or attack. Towards fellow countrymen, knights were to be merciful, humble and courteous, whereas above all, to noble ladies they would be gracious and gentle; courtly love. When it came to courting women, knights had to woo a lady; it was the idea that a nobleman would dedicate his life to the love of a/his lady. Knights would write poetry, letters and songs, anything to serenade and get into the good graces of the lady of his heart and would then build up enough ego to ask his lady to dance, when appropriate. It was all rather innocent and sweet and the more sissy in modern thoughts, the better it was in those days.
Chivalry in the early to mid 1900s, I like to refer to as the age of gentlemen. People see movies with people like Fred Astaire and Gene Kelley in them and men would follow their stereotypes to please the women of that era. Men took dance classes so they would feel confident going out on the town with a lady, some who could, would sing, they would never let a women pay