Who was the subject of an advertisement in a colonial American newspaper 250 years ago today?

“A CHOICE CARGO OF 250 PRIME SLAVES.”
In early June 1768 merchants Alexander Inglis and Nathaniel Hall advertised the sale of “A CHOICE CARGO OF 250 PRIME SLAVES, Just arrived, in the Ship Constantine, Thomas Gullan Commander, after a short Passage, directly from Angola.” Their advertisement provides various details about a particular slave trading voyage, enough to identify it as Voyage 17665 in Voyages: The Trans-Atlantic Slave Trade Database.
According to the database, the Constantine departed Bristol on April 21, 1767, and sailed to West Central Africa and St. Helena to purchase slaves. The database does not include entries for “Date trade began in Africa” or “Date vessel departed Africa,” but it does specify the “Date vessel arrived with slaves” in Savannah: June 1, 1768, the same day that Inglis and Hall’s advertisement first appeared in the Georgia Gazette. The merchants allowed just over a week before selling their slaves on June 9, allowing them two opportunities to advertise their human cargo in the colony’s only newspaper.
Given that more than a year passed between the beginning of the voyage and the ship’s arrival in Savannah, it appears that the Constantine spent quite some time on the African coast. The voyage for some of the enslaved Africans likely consisted of more than just the Middle Passage between Africa and North America, especially if Inglis and Hall accurately reported a “short Passage” across the Atlantic. Given the notoriously high mortality rates and deterioration of health experienced by survivors of the Middle Passage, Inglis and Hall may have exaggerated the length of the voyage across the ocean. Even so, some of the Africans among the human cargo likely spent weeks or months imprisoned aboard the Constantine before the vessel even departed for Georgia.
The database indicates that Gullan intended to purchase 400 slaves but only embarked approximately 275. According to Inglis and Hall, only 250 disembarked in Savannah. Nearly one in ten died during the Middle Passage. Unfortunately, the known records do not reveal the percentages of men and women or the ages of the enslaved Africans who arrived in the colonies via the Constantine.
The entry for Voyage 17665 does not list the advertisement in the Georgia Gazette as one of the sources, but I suspect that it was incorporated into the secondary source listed in the entry, David Richardson’s Bristol, Africa, and the Eighteenth-Century Slave Trade to America. Other entries do list advertisements from colonial American newspapers, highlighting their role in reconstructing the transatlantic slave trade.