Second paragraph of third tale (“The Trade that No One Knows”):

When, however, the boy had grown up, he said to his parents, “I am a man now, and I intend to marry, so I wish you to go at once to the king and ask him to give me his daughter for wife.” The astonished parents rebuked him, saying, “What can you be thinking of? We have only this poor hut to shelter us, and hardly bread enough to eat, and we dare not presume to go into the king’s presence, much less can we venture to ask for his daughter to be your wife.”

A collection of fairy tales supposedly collected in Serbia, but actually culled from five collections, one published in 1889 and the others during the first world war. I recognised one or two from other sources (King Midas and his ears), and the themes of course are very ancient; virtuous young men, beautiful young women, family and social dynamics, occasional magic spells and enchanted beasts, long journeys where odd things happen. Nothing that especially jumped out, though if I were still dungeon-mastering there would be some useful material. You can get Serbian Folktales here.