The DunBroch, MacGuffin, Macintosh, and Dingwall clans were once enemies locked in constant war, but when Vikings, Romans and Northern invaders threatened them from the seas the 4 clans joined together under the sword of Fergus to defend their lands. Eventually the the clans succeeded in protecting their lands from the invaders and formed the Kingdom of DunBroch and made the clan leaders Macintosh, MacGuffin and Dingwall their lords of the kingdom then crowned Fergus their king and Elinor their queen.
According to story artist Louis Gonzales, for the DunBroch castle, the production team didn't want a Germanic Cinderella-like castle, but an "earthy" castle, grittier than the pristine ones often seen in animated films. For inspiration, they visited the Eilean Donan and Dunnottar Castles.
The setting is in the early Middle ages of Scotland.
Everyone in Kingdom DunBroch is descended from Celts (Celts were ancestors of the Scottish and Irish clans).
Both Gaelic and Pictish culture is shown in the movie.
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