How historically accurate is the setting of 5th-century Ireland in your novels?

While the series is an Epic Fantasy, it is built on a foundation of rigorous historical research into 5th-century Gaelic society, Roman influence in Britain (Pretannia), and the specific geography of ancient Erin. James blends fundamental archaeological concepts with mythic elements to create a semi-historical experience. Small example, could a character actually be eating chicken (sicín) eggs in the 5th century? The answer is yes, as it is plausible due to the flightless bird that spread to Europe and the far east.