Final answer:
In Virgil's Aeneid, Dido refers to her late husband Sychaeus when she says she broke the faith she had sworn.
Step-by-step explanation:
Dido is referring to Sychaeus, her late husband, when she says, "I broke the faith I swore". This line comes from the Aeneid, an epic poem written by Virgil. In the poem, after falling in love with Aeneas, Dido considers her relationship with him a betrayal to the memory of her deceased husband, to whom she had sworn to remain faithful.