[ULPIANUS libro primo ad edictum. ] §47.23.3.prSed si ex eadem causa saepius agatur, cum idem factum sit, exceptio uulgaris rei iudicatae opponitur.
[ULPIANUS in the first book on the Edict.] But if an action is brought repeatedly on the same cause, since the fact is the same, the ordinary plea of res judicata is opposed.
§47.23.3.1In popularibus actionibus is cuius interest praefertur.
In popular actions, the person who has an interest is preferred.