Clasisims By Edrian_50 Mar 5, 1735 Sidney Creation Period: Jan 13, 1750 to Jan 13, 1750 Treaty of Madrid. Period: Feb 25, 1750 to Feb 27, 1750 Julian calendar in Great Britain. Period: Mar 5, 1770 to Mar 5, 1770 Boston Massacre. Period: May 8, 1770 to May 8, 1770 Real Britanic Opera Inagutation Period: Oct 22, 1770 to Oct 22, 1770 Manuel Belgrano Born Period: Nov 20, 1770 to Nov 20, 1770 Calculator invention Period: Feb 17, 1771 to Feb 18, 1771 Spanish Glorious March.