Here's why:
* Classical Allusion: This is a literary device where authors refer to figures, events, or stories from ancient Greek or Roman mythology, history, or literature.
* Sonnet 55: The sonnet explores the power of poetry to immortalize a beloved. The speaker uses Mars as a symbol of something that is traditionally considered powerful and enduring. He compares his poetry to Mars' "mighty" "hand" that can "grasp" and hold onto time, suggesting that his poetry has the power to make his beloved's beauty and memory last forever.
By using Mars as a reference, Shakespeare adds a sense of grandeur and historical weight to his poem. It also allows him to express the idea of the poem's power in a more vivid and engaging way.