In the poem, what do the mighty dead refer to?

In the poem “A Thing of Beauty,” “the mighty dead” refers to the noble and heroic figures from history or mythology whose deeds have left a lasting impact on humanity. Keats evokes these figures to emphasize that their greatness and contributions continue to inspire and uplift the human spirit long after their physical death. Their stories, along with their acts of bravery and virtue, remain sources of beauty and inspiration, offering timeless joy and solace to those who reflect on them. Thus, the “mighty dead” represent the enduring power of beauty in the form of human legacy and heroism.

This question related to Poem 3 English Flamingo Class 12th NCERT.
From the Poem 3. A Thing of Beauty.
Give answer according to your understanding.