The relationship between Achilles and Patroclus is a key element of the stories associated with the Trojan War. In the Iliad, Homer describes a deep, meaningful relationship between Achilles and Patroclus, where Achilles is tender toward Patroclus, but callous and arrogant toward others. Its exact nature—whether homosexual, a non-sexual deep friendship, or something else entirely—has been a subject of dispute in both the Classical period and modern times.
Homer, in the original epic, never explicitly casts the two as lovers, but they were frequently interpreted and depicted as lovers in the later archaic and classical periods of Greek literature, particularly in the works of Aeschylus, Aeschines and Plato. Xenophon's Symposium established a key counterargument, asserting the relationship was not sexual, but instead a platonic perfect friendship. Ancient writers referenced both sides, and additionally debated whether and how the relationship fit into the ancient institution of pederasty. Medieval scholars largely characterized the relationship as a platonic friendship, sometimes even suppressing Achilles' certain aspects that may or may not be interpreted as homoerotic. Since the 1800s, contemporary critics have returned to the debate of the Iliad's portrayal of the relationship. Some classicists and queer studies scholars argue that it was homosexual, homoerotic, or latently homosexual, with the Iliad describing these elements implicitly. Some historians and classicists disagree, stating that there is no textual evidence for a sexual relationship, and that repressed homosexuality here is unfalsifiable.