Welsh wrth

← Proto-Celtic *writ- (inherited)

← Proto-Indo-European *wert- (inherited)

← Latin versus (cognate)

← Old Welsh gurt (inherited)

← Old Irish fri (cognate)

→ Welsh gwrth- (cognate)

→ Welsh wrth hyn (compound)

→ Welsh gwrthwynebu (mention)

→ Irish le (cognate)

→ Irish frith- (cognate)

→ Middle Irish fri (cognate)

→ Old Irish fri (cognate)

→ Old Irish frith- (cognate)