Summary I. Rationale for the rule and comparison with analogous provisions contained in other EU regulations II. Low likelihood of courts belonging to different Member States having concurrent jurisdiction under the ESR III. Application of the traditional requirements of lis pendens as devised in earlier instruments to the specific context of succession disputes A. Identical cause of action B. Identical parties C. Temporal priority IV. Effects deriving from the application of the rule V. Absence of a rule addressing cases where parallel proceedings are pending before a third country court