In the epic poem The Iliad, Homer describes the most intricate details and clarifies the essential information about the characters in the epic. Therefore, he skillfully and linguistically employs relative clauses to highlight linguistic coherence by linking ideas and information between clauses and sentences. This contributes to the reader's comprehension and understanding of the text, allowing them to follow the sequence of events in an organized and orderly manner. From this resource study, the researcher extracted that relative clauses can be categorized into three types: the true relative clauses, the true relative clauses with Greek verb moods, and the estimative relative clauses. In true relative clauses, using the relative pronoun in the sentence facilitates the reader's recognition of it as an explicit connecting clause, serving various functions. As for true relative clauses with the Greek verb moods, the relative clauses play a distinct and clear role in three moods: the indicative mood, the Subjunctive mood, and the optative mood, each having its functional role with the relative clause, negating each clause individually. On the other hand, estimative relative clauses are phrases where the relative pronoun is not employed in the sentence, but other linguistic alternatives exist in the subordinate clause, indicating the previous clause to add or describe information. These are some of the functions of the relative clause".