Statistics for occurrence #1 of “Rockingham” in chapter 20 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 5, 13th edition.:

...ere alarmed at the interruption of trade, the injury to colonial credit, and the loud and distinct cry of encouragement to American industry; and letters concerted between the merchant Trecothick and Rockingham , were sent among them, to countenance applications to parliament. The traditions of the public offices were equally at variance. Successive administrations had inquired for some system by which...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Rockingham 392 66 2 0 0 user votes
Richard Rockingham 2 0 2 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.