However , many unionists took offence at the signing of the Agreement in the Throne Room of the castle , igniting their opposition further .
Irish Taoiseach ( prime minister ) Garret FitzGerald believed that signing the Agreement in Hillsborough Castle would mollify unionist opposition to the Agreement somewhat .
Many unionists took offence at the signing of the Agreement in the Throne Room of the castle , igniting their opposition further .
Irish Taoiseach ( prime minister ) Garret FitzGerald believed that signing the Agreement in Hillsborough Castle would mollify unionist opposition to the Agreement somewhat .