44It is clear from the case-law of the Court on the Brussels I Regulation that only a legal obligation freely consented to by one person towards another and on which the claimant’s action is based is a ‘matter relating to contract’ within the meaning of Article 5(1) thereof (see judgment in Kolassa, C‑375/13, EU:C:2015:37, paragraph 39). By analogy, and in accordance with the aim of consistency mentioned in paragraph 43 of the present judgment, it must be held that the concept of ‘contractual obligation’ within the meaning of Article 1 of the Rome I Regulation designates a legal obligation freely consented to by one person towards another.
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