Five years I have reigned
During which time
I have lain awake each night

And prowled by day
In the sacred grove
For fear of the usurper,

Perfecting my cold dream
Of a place out of time,
A palace of porcelain

Where the frugivorous
Inheritors recline
In their rich fabrics
Far from the sea.

I find these few lines deeply even profoundly moving.  The whole poem may be found at http://www.troublesarchive.com/artforms/poetry/piece/the-last-of-the-fire-kings 

There it states,”Derek Mahon’s reference to an ancient curse can be construed as referring to the weight of tradition in Northern Ireland and the legacies of division and violence.” However, it is the mythological images that it conjures up and which I do not fully understand which particularly appeals to me. Although it may help a little to know that a frugivore is an animal that thrives mostly on raw fruits, succulent fruit-like vegetables, roots, shoots, nuts and seeds. It can be any type of herbivore or omnivore where fruit is a preferred food type.

For those interested in an analysis or interpretation of the whole poem, there is a PhD thesis from Durham at https://core.ac.uk/download/pdf/108461.pdf