Queen Brunhild married Sigeburt I of Austrasia. Her sister married Sigebert's brother. At least, they were married, until Brunhild's sister died under mysterious circumstances and he re-married three days later. His new queen, Fredegund, would have a bitter rivalry with Brunhild that would change the fate of both of their nations.
A source that was particularly helpful in making this episode was The Dark Queens: The Bloody Rivalry that Forged the Medieval World
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