Aha! the new question threads, just what I need...
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So, you're writing a commercial historical novel, an action-adventure story set during the Roman invasion of Britain, and you're faced with all these unpronounceable Celtic names – CYNWRIG, GWRTHEYRN, IUDICAEL, SEISYLL.
What do you do? – render them phonetically into modern English, make up names that sound convincing but read more smoothly, stick with the unpronounceable originals (this option frightens me, hence this thread), something else?
All help will be much appreciated.
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[Don't forget to upvote the answers you like!]
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So, you're writing a commercial historical novel, an action-adventure story set during the Roman invasion of Britain, and you're faced with all these unpronounceable Celtic names – CYNWRIG, GWRTHEYRN, IUDICAEL, SEISYLL.
What do you do? – render them phonetically into modern English, make up names that sound convincing but read more smoothly, stick with the unpronounceable originals (this option frightens me, hence this thread), something else?
All help will be much appreciated.

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[Don't forget to upvote the answers you like!]