Statistics for occurrence #1 of “Isaac Royall” in chapter 5 of Historic leaves, volume 4, April, 1905 - January, 1906:

...sion in Antigua, from whence he brought with him twenty-seven slaves, whose old brick quarters, with its huge fireplace, is probably the last existing vestige of slavery in Massachusetts. Colonel Isaac Royall , Jr., son of the merchant, was a Loyal-1st, and at the breaking out of the Revolution went to England, leaving for disposal by his agents, among other chattels, his slaves Stephen, George, Hagar, Mir...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Isaac Royall 330 17 38 1 0 user votes
Isaac Royall Esq 3 0 1 0 0 user votes

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