If there were space left for them, the Brehain may be an interesting unit in Hibernia, but, they would've been a later development (in the later BCs, probably not present during the early colonization of Hibernia, but they would be present before 14 AD). However, Fianna likely preceded them, as the need for a unified protectorate force was necessary to keeping the Gaelic parts Gaelic, and could be like Celtic Spartans, but also an afterthought. The Fianna didn't fight against Gaels under any circumstance (unless the Gaels joined with an invader, but in that case, they were probably no longer considered Gaels, and outcast). The Fianna could be a unit available to any Celtic faction in Hibernia. But that isn't really on the subject of the map.
However, if Brehains were used, there'd be another two-handed weapon unit, and could use the groovy looking falx animations (though the actual Irish two-handed sword martial arts, specifically anabh, literally 'two hand', would look TOTALLY different).
As far as the map is concerned, I really like how the British map has developed recently, I think we've accomplished a lot with it. However, there was some talk of dividing Caledonia again, but in any event, southern Britain and Hibernia are about finished, in as much as territory divisions, and I think Caledonia too, maybe.
Oh, and good point about 'exemption'. The druid class was valued for their knowledge, but with Celtic custom and religion, being largely based around warfare and the glory earned from it, such an esteemed individual wouldn't be disallowed from engaging in such a practice, as it was the main way to earn prestige. While many druids (used as a catchall here for Carnute Cingetos, Druidae, and Brehain) did operate in warfare from a command position, there were those who did seek glory from a more direct interaction with fighting, especially in Gaul and iron age Ireland, but they did so voluntarily, and it'd not be held against them if they didn't wish to fight, as they had numerous other high value skills.
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