Fódlan's Locket was built in Imperial Year 1101 through the combined efforts of the Adrestian Empire, Holy Kingdom of Faerghus, and Leicester Alliance. It was intended to be an impregnable bulwark against additional invasions from Almyra, a powerful and aggressive country to the east. House Goneril was charged with manning the fortress.
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In Imperial Year 1180, Fódlan's Locket came under attack from Almyra at a time when Lord Holst Goneril had fallen ill. Holst sent for his sister, Hilda, to command the fortress's garrison in his stead.