The World of Ice & Fire (mentioned)|
A Game of Thrones (mentioned)
A Feast for Crows (mentioned)
Ser Morgil Hastwyck was a knight from House Hastwyck who lived during the reign of King Aegon IV Targaryen. He was renowned for slandering Queen Naerys Targaryen and being confronted by her brother, Prince Aemon the Dragonknight, in trial by combat. According to Grand Maester Kaeth's Lives of Four Kings, these accusations were instigated by Aegon IV himself, who was at the time quarreling with his son and heir, Prince Daeron.
Well, the singers embroider everything, but there was a Ser Morgil and he did accuse Naerys of various things... probably adultery and treason with Aemon, but I haven't nailed all that down yet....