|In 298 AC, the Mountains of the Moon
|A Game of Thrones (appears)
In his service for Tyrion Lannister, one of Jyck's regular tasks was to hire prostitutes for him. He sometimes failed to warn the women that Tyrion is a dwarf, leading to some unpleasant situations for Tyrion when the prostitutes first saw him.
A Game of Thrones
Lady Stark wants to bring Tyrion to the Eyrie and they reach the Mountains of the Moon. As a captive, Jyck is sullen and miserable. When the party is attacked by Vale mountain clans, Jyck is cut down from behind while he is slicing at a man in front of him. After the skirmish, Bronn pulls the boots off Jyck's feet, as they are much finer than his own, and Tyrion takes Jyck's horse. Reflecting the results of the engagement and Jyck's bareback charge, Tyrion thinks that he was a fool to the end.
Tyrion later meets his father, Lord Tywin Lannister, who comments on how Tyrion's capture led to the fighting in the riverlands, stating that no man sheds Lannister blood with impunity. Tyrion points out that no Lannister blood has actually been lost and mentions the death of Jyck and Morrec in this context.