Final answer:
The cause of Percy's anger is not detailed in the supplied texts. In Rick Riordan's series, Percy Jackson's anger may stem from his conflicts with gods like Ares and his own personal difficulties, while his mother's passing is not a cause. Ancient Greek heroes like Perseus dealt with divine interference and prophesied fates, influencing their emotional states.
Step-by-step explanation:
Who or What Was Causing Percy to Be Angry?
The portion of text provided does not directly answer the question about Percy's anger. Considering the character Percy Jackson from Rick Riordan's Percy Jackson & the Olympians series, his anger can be attributed to various sources. Percy often finds himself in conflict with many figures, including gods like Ares, as well as dealing with personal challenges like his ADHD. However, in the context of Riordan's series, Percy's anger is not directly caused by his mother's passing, as she is alive for most of the books. Annabeth Chase, another central character, is more often Percy's friend and ally rather than a source of his anger.
A closer interpretation related to Greek mythology, however, would indicate that characters like Perseus, not Percy Jackson, dealt with anger and challenges stemming from the gods' interference in their lives or the trials they were subjected to, much like the difficult task assigned by the king interested in Perseus' mother. Achilles' life decisions, guided by his mother to avoid his fated early death, also reflect the complex relationships between Greek heroes and their divine relatives or destinies.