For those researching family in Ireland, the book Illustrations, Historical and Genealogical of King James’s Irish Army List, 1689 might be useful in your trek back in time. (In an 1861 updated second edition, by John D’Alton.)

The work contains a vast wealth of family history, including information outlining the lineage, honours and achievements of families connected with Ireland, either through birth, rank, title or alliance. As many of the sources used in compiling the two volumes are now lost they stand as a highly valuable tool for Irish family research.

Visit their site for a bit more description of the content and links to PDF versions of the two volumes.

You can also find variously formatted versions of the books on Archive.org. Click here for one version although the header pages differ from the Ask About Ireland versions, so I’m unsure if they are earlier versions or some other form.

But, the Archive.org version does have searchable text formats, so you can look for the surnames you hope to find more easily…