He condescends to write a poem at Edinburgh, but then Edinburgh was of English origin and name.

Even with that help he cannot be patient of the place.

The poem is a recollection of an Italian journey, and he forgets in memories of the South--though surely Edinburgh might have awakened some romantic associations-- the clouded Forth, The gloom which saddens Heaven and Earth, The bitter East, the misty summer And gray metropolis of the North.
Edinburgh is English in origin, but Tennyson did not feel England beyond the Border.

There the Celt intruded, and he looked askance upon the Celt.

The Celtic spirit smiled, and took its vengeance on him in its own way.