Where does “trälinna” come from?

trälinna (Swedish) comes from Swedish träl, from Old English þræl, from Old Norse þræll, from Proto-Germanic þragilaz, from Proto-Indo-European trāgʰ- — pull, drag, race, run; to pull, drag, race, run.

Ancestry of “trälinna”, step by step

StepLanguageWordMeaning
1Swedishträla thrall, a slave (forced laborer)
2Old Englishþræla slave, someone beholden to a lord or master
3Old Norseþrællslave
4Proto-Germanicþragilazrunner; gofer; servant
5Proto-Indo-Europeantrāgʰ-pull, drag, race, run; to pull, drag, race, run
Every word from Proto-Indo-European trāgʰ- →Every word from Proto-Germanic þragilaz →Every word from Old Norse þræll →