This isn't an answer but anyways. The line "and the grandeur that was Rome" was in the poem "To Helen" by: Edgar Allan Poe. This is where I first heard of it so maybe if you refer to that poem it can help you figure out the meaning. Sorry I couldn't help you any more . :)
Grandeur is a word used to describe something that is impressive or amazing. It means magnificence or intellectual greatness. The design and appearance of old palaces and castles is described as grandeur.
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"To the glory that was Greece, and the grandeur that was Rome" is a line from the poem "To Helen" which was written by Edgar Allan Poe,
Magnificence or splendour. It is usually applied to grand, impressive scenery or buildings. eg The grandeur of Florence's architecture surpasses even that of Rome. eg The grandeur of the Canadian Rockies is created by a combination of rugged mountains and beautiful lakes.
Beauty and grandeur of a king
Magnificent appearance or display, grandeur.
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No, no, it was the glory that was Greece, and the grandeur that was Rome. Ancient Rome was certainly grand, and to modern thinking the Greece of ancient times seems glorious in many ways, with its art, architecture, literature, and philosophy.
Giuseppe Gatteschi has written: 'The grandeur that was Rome' -- subject(s): Antiquities 'Rome,past and present'
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