… in its Third Annual David Brion Davis Lecture Series, March 5-7. Titled “ Principles and Agents: The British Slave … and Expansion of the British Slave Trade, 1660-1807” March 5, 4:30 p.m. Mezzanine, Beinecke Rare Book and … it when they did. “African Agency in the Slave Trade” March 6, 4:30 p.m. Linsly-Chittenden, Room 211, 63 High St. …