In an old Kraków apartment a framed Irish poem still hangs on the wall nearly 20 years after the death of the man who hung it there. The man was the Polish Nobel Prize-winning poet and writer Czeslaw Milosz; the framed poem is Mise Raifteirí, by Antoine Ó Raifteirí. The original Irish is accompanied by an English translation by Milosz’s fellow Nobel laureate Seamus Heaney. Echoing Raifteirí’s take on the poet’s life in a handwritten dedication, Heaney describes Milosz as someone “who came tramping west by the light of their heart, and shone for us”. The poem was discovered on...