Kashubian

He has described himself as having four parallel identities: a proud son of Gdansk, the formerly German port city of Danzig on the Baltic Sea; a Kashubian, an ethnic minority native to northern Poland with its own language and traditions; a Pole and a European.

He speaks Polish, Kashubian, German and English, a language he barely knew when he took a break from Polish politics in 2014, to take a senior job in Brussels, but mastered quickly.