21 February

Pope Alexander III canonises Becket at Segni.

Thomas Becket Never caught

Four of Henry II's knights cut down the Archbishop of Canterbury in his own cathedral in 1170. Within three years he was a saint and the king did penance.

Madeleine Smith makes the first of three recorded purchases of arsenic.

Madeleine Smith Acquitted

A Glasgow architect's daughter, a secret lover, his bundle of letters and three purchases of arsenic. In 1857 the jury said: not proven.