A night of reckoning ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Jonathan Wiggs/Globe Staff The Isaac Royall House in Medford is the only freestanding slave quarters north of the Mason-Dixon line. Royall House & Slave Quarters The Royall House was built in the 18th century, and at one point housed the largest group of enslaved Africans in Massachusetts. Clennon L. King Preservationist Joseph McGill Jr. reflects after overnighting with ten others in the Royall House. Clennon L. King Roxbury textile artist Ifé Franklin, 54, woke up sobbing the morning after spending the night. Clennon L. King Ellen Watters Sullivan, 58, reaching to turn off an alarm, was one of three guests who acknowledged their families enslaved Africans. Clennon L. King Fred Small, 61, a reverend at a Unitarian Universalist church in Cambridge, meditates the morning after. Clennon L. King A plaque in the yard tells the story of the Royall House and Slave Quarters.