“Finely researched and lucidly written . . . details the rise, ebb, and flow of the idea of a common Celtic identity linking Ireland and Wales.” —The New York Review of Books Who are the Celts, and what does it mean to be Celtic? In this book, Caoimhín De Barra focuses on nationalists in Ireland and Wales between 1860 and 1925, a time period when people in these countries came to identify themselves as Celts. De Barra chooses to examine Ireland and Wales because, of the six so-called Celtic nations, these two were the furthest apart in terms of their linguistic, religious, and socioeconomic differences. The Coming of the Celts, AD 1860 is divided into three parts. The first concentrates on the emergence of a sense of Celtic identity and the ways in which political and cultural nationalists in both countries borrowed ideas from one another in promoting this sense of identity. The second part follows the efforts to create a more formal relationship between the Celtic countries through the Pan-Celtic movement; the subsequent successes and failures of this movement in Ireland and Wales are compared and contrasted. Finally, the book discusses the public juxtaposition of Welsh and Irish nationalisms during the Irish Revolution. De Barra’s is the first book to critique what “Celtic” has meant historically, and it sheds light on the modern political and cultural connections between Ireland and Wales, as well as modern Irish and Welsh history. It will also be of interest to professional historians working in the field of “Four Nations” history, which places an emphasis on understanding the relationships and connections between the four nations of Britain and Ireland.