Ancient Yet Still Powerful

In "The Colossus," Sylvia Plath refers her father to the large, powerful, artifact of the past. For an example, she refers to his lips as "great lips" (line 4). She also speaks about something similar to wanting to kill him, even after he had died: "Thirty years now I have labored / To dredge the silt from your throat" (lines 8-9). Although, his physical presence in her world had ceased, he still exists in her, taking a large part of her, since she refers to an object--the Colossus of Rhodes, which I have assumed from her mentioning of the sun--which is considered one of the Seven Wonders of the World. It was actually destroyed by an earthquake after 54 years of standing, which is the age her father was at when he passed away. Even after it's wreckage, the Colossus is still alive, intriguing people with wonders. In a sense, one doesn't die out until he/she is completely forgotten. Since not only can't she forget her father, but she is still struggling with the memories of him inside her, he is not completely dead. This poem extravagantly portrays his strong existence in her.
What is interesting in her poem is the fact that she includes a lot of Greek elements but not only so, mentioning the Roman Forums. She actually directly relates him to the Roman Forum in line 18. While Greek mythology acknowledges lying as a source of winning, Roman mythology doesn't. I am not sure yet why she included a mixture of the two ancient societies, but I think there is something to it. I think it is interesting to do more research on this topic and get more insights about this poem.