Customs Lawyer

Advice and litigation in national and Community customs law

Indirect taxation law

Energy/environmental taxation

Criminal customs law

ADVENIAT is a "niche" law firm that advises and litigates with corporate clients in national and Community customs law, indirect taxation law, energy/environmental taxation and criminal customs law.


ADVENIAT was founded by Gaspard de BELLESCIZE, a member of the Paris Bar, after years of experience with leading figures in customs matters in several law firms specialising in customs and European Union law: Gide, Godin Associés, Harving Avocats, CMS Francis Lefebvre avocats.


Based in Paris, the firm has also opened offices in Lyon during 2021.


The firm's consulting services focus on complex, high-stakes issues, with a view to securing, ensuring compliance andoptimizing customs practices and international trade for companies.


The firm assists its clients in pre-litigation and litigation before the national judicial and administrative courts, against the Administration and/or between parties before the commercial courts, as well as before the Community courts.


The firm's solid reputation, particularly in litigation, is the reward for years of daily adherence to our principles: excellence, high standards, absolute confidentiality, independence, responsiveness and client satisfaction .


The firm does not communicate on its clients, who are notably active in industry, petrochemicals, aeronautics, luxury goods, the wine sector, the pharmaceutical sector and defence. ADVENIAT is a customs referent for trade unions and professional federations.

Maître Gaspard de Bellescize

Lawyer at the Paris Bar


Our Paris offices

54 rue Pergolèse
75016 Paris

Our offices in Lyon

54 cours Lafayette
69003 Lyon

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