Quote:
Originally Posted by Hemi-Cuda
Ned wouldn't have had to hide the child if it was Robert's though, he was already supposed to marry Lyanna and he had plenty of ####### children already. But if it's Rhaegar's then Ned knew Robert would kill him during the purge of all Targaryens as a direct threat to his rule, and Lyanna probably made him swear to protect John before she died
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There's references to the promise he swore to Lyanna on her "bed of blood"