The Penguin Book of Contemporary British Poetry
The inclusion of Seamus Heaney ( who , although born in Northern Ireland , held a Republic of Ireland passport ) led to him to deliver a riposte in his poem , "An Open Letter" ( 1983 ) : 
<triplet> Seamus Heaney <subj> Republic of Ireland <obj> country of citizenship <triplet> Northern Ireland <subj> Republic of Ireland <obj> different from <triplet> Republic of Ireland <subj> Northern Ireland <obj> different from