In this story I'm reading, there are these two blokes 'aving a bit of a barney:
"Atque ea rixa adeo inter eos exarsit, ut etiam pugnis certarent. Tandem in ius ambulant."
And now a quarrel erupted between them, and they even fought with their fists. Finally they walked in ius.
I'm assuming it means something like went to court (over the matter), but I can't find that meaning of ius anywhere. Advice would be appreciated.