Rathcroghan (Crúachain) is often referred to as both a ‘Celtic’ Royal Settlement and a sacred burial place; it is one of several major royal sites in ancient Ireland, such as Tara, Co. Meath, Knockaulin, Co. Kildare, and Navan Fort near Armagh, that are frequently mentioned in early literature.

While these sites had special importance in early historic times, and in some cases bore and extraordinary weight of myth and legend, we now know that they are older archaeological assemblages of impressive complexity and size.

This book is the result of a major programme of archaeological field research at Rathcroghan in County Roscommon in the West of Ireland. The project involved the use of a range of geophysical techniques to explore a number of extraordinary monuments in the Royal Site.