8 November 1685
Mary Clavering (later MCC) was born, the elder of her parents' two surviving children.
Late October 1714
On her appointment as Lady in Waiting to Caroline of Anspach
, the new Princess of Wales, MCC began keeping a private diary to record the true version of what went on at Court, in opposition to the "perpetual Lies that One hears."
With her husband, Lord Cowper
, suddenly under suspicion of harbouring Jacobite sympathies, MCC gave way to anxiety about the outspokenness of the Court diary she had been keeping since October 1714: she destroyed most of it.
10 December 1723
MCC wrote her will two months to the day after the death of her husband, Lord Cowper
5 February 1724
MCC, not yet forty and a widow of less than four months, died at Cole Green
, of "what is often talked of, but seen in very few Instances—a broken Heart,"
according to her elder daughter.
MCC's descendant Charles Spencer Cowper edited and first published her surviving diary; he omitted, however, passages which he considered salacious or unsuitable.