This article examines an under-appreciated nexus of inter- and intratextual resonance between Theocritus Idyll 15, and Catullus poems 36 and 64. I explore the nexus from multiple angles. In section 1, I argue that the intertext between 64.96 and Idyll 15.100 enriches readings of poem 64, adding depth to its treatment of amor while highlighting important structural elements of the poem. In section 2, I analyse the relationship between poems 36 and 64, arguing that the window allusion to Idyll 15 effectively reinforces poem 36’s agenda. In section 3, I argue that hearing poem 36 in poem 64 causes interpretative difficulties; Catullan intertextuality is not always successful.