In this article Eva Urban describes a historical tradition of Breton enlightenment theatre, and examines in detail two multilingual contemporary plays staged in Brittany: Merc’h an Eog / Merch yr Eog / La Fille du Saumon (2016), an international interceltic co-production by the Breton Teatr Piba and the Theatr Genedlaethol Cymru (the Welsh-language national theatre of Wales); and the Teatr Piba production Tiez Brav A Oa Ganeomp / On avait de jolies maisons (2017). She examines recurring themes about knowledge, enlightenment journeys, and refugees in Brittany in these plays and performances, and presents the argument that they stage cosmopolitan and intercultural philosophical ideas. Eva Urban is Senior Research Fellow at the Senator George J. Mitchell Institute for Global Peace, Security and Justice, Queen's University Belfast. She has held a Région de Bretagne Postdoctoral Research Fellowship at the Centre for Breton and Celtic Studies, University of Rennes 2, a research lectureship in the English Department, University of Rennes 2, and a British Academy Postdoctoral Fellowship at the University of Cambridge. She is the author of Community Politics and the Peace Process in Contemporary Northern Irish Drama (Peter Lang, 2011) and has published articles in New Theatre Quarterly, Etudes Irlandaises, Caleidoscopio, and chapters in book collections.