Article 4 Brussels Convention 72/454/EEC

If the defendant is not domiciled in a Contracting State, the jurisdiction of the courts of each Contracting State shall, subject to the provisions of Article 16, be determined by the law of that State.

As against such a defendant, any person domiciled in a Contracting State may, whatever his nationality, avail himself in that State of the rules of jurisdiction there in force, and in particular those specified in the second paragraph of Article 3, in the same way as the nationals of that State.