I think Celtiberia is a very nice faction, because it's an outstanding addition to north eastern Spain. This way, Lusotania won't be OP, and, if you play Romans or Gauls or even Karthadastim you can count on some difficulties in obtaining that area. Besides, the Celtiberian culture was rather advanced in for example weapons. Those weapons were copied by other civs and used all over the European continent.
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