Early Romani characters in Peaky Blinders often speak Romanian instead of Romani.
The series presents the Shelby family and related characters as having Romani and Irish Traveller connections, so their private conversations are sometimes intended to signal Romani identity. In the early episodes, however, the dialogue frequently uses Romanian, the national language of Romania, rather than Romani, the Indo-Aryan language associated with Romani communities.
Romanian and Romani are different languages despite their similar names. Romanian is a Romance language descended largely from Latin and spoken primarily in Romania and Moldova. Romani developed from Indo-Aryan roots and has many dialects shaped by centuries of migration across Europe.
This production error is a common source of confusion among viewers. Later seasons made greater use of Romani-related speech and vocabulary, but the early-language mistake remains part of the show’s documented production history. The quiz asks what was spoken on screen, not what the characters were supposed to speak, so Romanian is the canonical answer.