Passage in Sophocles’ Antigone

I was reading Antigone for the first time today, and the passage above confused me slightly, with its mention of Cleopatra (not the famous one, I assume) and the Erechthids. I looked up other translations of the same passage, and none had both of those terms. Additionally, I tried googling and couldn’t find what it’s referring to. This passage is from The Complete Greek Tragedies, Edited by David Grene & Richmond Lattimore, Third Edition, Edited by Mark Griffith & Glenn W. Most, Antigone Translated by Elizabeth Wyckoff. I would love to hear any insight into the translation of this passage and it’s meaning.