Ronia, the Robber's Daughter (Swedish: Ronja rövardotter) is a children's fantasy book by the Swedish author Astrid Lindgren, first published in 1981. Ronia is a girl growing up among a clan of robbers living in a castle in the woodlands of early-Medieval Scandinavia. Ronia grows up with Matt's clan of robbers as her only company, until a rival robber group led by Borka moves into the other half of the castle, exacerbating the longstanding rivalry between the two bands. One day, Ronia sees Birk Borkason, the only son of Borka, idling by the chasm. He is the only other child she has ever met. They get very close but both know that they cannot tell their families. Birk and Ronia were consequently forced to hide into the woods, where they live in a cave and experience several harrowing adventures with the wood's indigenous wildlife, including trolls, forest gnomes, and harpies.