skos:altLabel | - Lord
- Robert
- his son
- Robert Stewart
- Foreign Secretary
- Castlereagh
- '''Castlereagh<br />2nd<br />Marquess'''
- ''Viscount Castlereagh''
- Castlereagh, Viscount
- Henry Robert Stewart, 2nd Marquess of Londonderry
- Hon. Robert Stewart
- Lord C[A]ST[LE]R[EA]GH
- Lord Castelreagh
- Lord Castlereagh
- Lord Londonderry
- Marquess of Londonderry
- R Stewart
- Robert Stewart, 2nd Marquess of Londonderry
- Robert Stewart, Lord Castlereagh
- Robert Stewart, the future Lord Castlreagh
- Robert Stewart<br />'''Viscount Castlereagh'''
- Robert Stewart<br>'''Viscount Castlereagh'''
- Robert Viscount Castlereagh
- Robert, 2nd Marquess
- Robert, Viscount Castlereagh
- Robert<br />'''2nd<br />Marquess
- Robert<br />'''2nd<br />Marquess'''
- Robert<br>'''2nd<br>Marquess'''
- Second Marquess of Londonderry
- Stewart's son
- The 2nd Marquess of Londonderry
- The Marquess of Londonderry
- The Viscount Castlereagh
- Robert Stewart, 2nd Marquess of Londonderry, 2nd Earl of Londonderry, 2nd Viscount Castlereagh, 2nd Baron Londonderry
- Viscount Casterleagh
- Viscount Castlereagh
- <small>The Right Honourable</small><br>'''Viscount Castlereagh'''
- <br />Robert Stewart<br />2nd '''Marquess of Londonderry'''<br /><small></small>
- second Marquess
- the Marquess of Londonderry
- the Viscount Castlereagh
- who imposed
- Robert Stewart, Viscount Castlereagh (Lord Castlereagh)
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