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The Stern Knight can be found inside of the palace in Marsalim

There is a woman in the southwest corner of Orewell that regrets saying certain nasty things to her son some ten years ago, who went off to become a knight. She wishes he would come back to the city, so that’s your cue. Fast travel to Marsalim and enter the palace to the north. The Stern Knight is who you’re looking for and he’s standing to the left, on the ground floor, near the cells. You will need to use Guide or Allure on him, but Ophilia needs to be level 45 for this and you probably have a low chance to Allure him with Primrose. Once you’ve managed to get him, return to Orewell and speak to the mother with him in tow to finish the quest.