In the mid 1980s, he played a leading role in the joint unionist campaign against the AngloIrishAgreement.
BBC: Profile: Peter Robinson
2.
Thatcher signed the Anglo-Irish Agreement which laid the foundation for improved North-South cooperation and ultimately the Good Friday Agreement.
WSJ: Leaders Pay Tribute to Thatcher
3.
Those included not just signing the Anglo-Irish Agreement in 1985, but also her willingness to authorise back channel contacts with the IRA leadership during the hunger strikes in the early 1980s.
BBC: Margaret Thatcher: Heated debate over NI legacy