At 7 o’clock on a bleak February morning in 1542, King Henry VIII’s fifth wife Katherine Howard, so enfeebled by fear and misery that she could hardly stand, was half-led, half-carried from her cell in the Tower of London to the scaffold in a nearby courtyard. Watching as the axe fell on her mistress’s neck, and knowing it would be her turn next, was her lady in waiting Jane Rochford.