←
Old English trēo (alter)
←
Middle Dutch trouwe (cognate)
←
Proto-Germanic *trewą (inherited)
←
Proto-Germanic *trewwō (inherited)
←
Proto-West Germanic *treu (inherited)
←
Proto-West Germanic *treuwu (inherited)
←
Old High German triuwa (cognate)
←
Old Norse tré (cognate)
←
Old Frisian trē (cognate)
←
Old Saxon trio (cognate)