He lost his Slovak and EU citizenship after gaining British nationality through a marriage Slovakia refuses to recognise.

A Slovak man who lost his citizenship after obtaining British nationality through his same-sex marriage has seen his case advance at two European courts, in a dispute that could eventually have consequences for Slovakia’s restrictions on dual citizenship, according Napunk.

The European Court of Human Rights (ECHR) has asked Slovakia to respond to his complaint, while Slovakia’s Constitutional Court has turned to the Court of Justice of the European Union (CJEU) for guidance on EU law.

The unnamed Slovak man married his male partner in Britain in 2022 and obtained British citizenship through the marriage.

Under changes adopted in Slovakia in 2022, people who acquire another citizenship through marriage or while residing permanently in that country can retain their Slovak citizenship.