Lady Frances Bentinck (1684-1712) (1684–1712) Parents Anne Villiers William Bentinck, 1st Earl of Portland Children George Byron William Henry Byron William Byron unknown daughter Byron Siblings Henry Bentinck, 1st Duke of Portland Isabella Bentinck Willem Bentinck Mary Capel, Countess of Essex Lady Anna Margaretha Bentinck Lady Sophia Bentinck Lady Elizabeth Adriana Bentinck Lady Barbara Bentinck Lady Harriet Bentinck Willem Bentinck Charles John Bentinck Partners William Byron, 4th Baron Byron