Gendry had started to put his clues together. He had been visited by two Hands of the King. Both had inquired about his mother. They'd both taken considerable care in taking in his appearance. And both showed him some measure of kindness which, knowing what he did now, was because he was the son of their close friend.

And they both died shortly after.

"... Lord Stark. He denied King Joffrey. That was why he was executed. He renounced it before he died. But for some reason, he didn't think Joffrey should be king. That's how I've heard it. Is that true?"