sentences:  However, Henry VIII had excluded the Scottish regal line from the English succession in his Will, placing the Grey sisters next-in-line after his own children.Some time before August 1552, Katherine Grey was betrothed to Henry, Lord Herbert, heir apparent to William Herbert, 1st Earl of Pembroke.In 1553, as King Edward VI was dying, the King and his Chief Minister, John Dudley, 1st Duke of Northumberland, planned to exclude Edward's sister Mary Tudor from the succession in favour of Katherine's elder sister, Lady Jane Grey.