sentences:  One of Lady Katherine's friends, Lady Jane Seymour, daughter of the Duke of Somerset, introduced her brother, Edward Seymour, 1st Earl of Hertford, to Lady Katherine Grey (so restyled after the annulment of her first marriage).Without royal assent, the two were married in December 1560 during a secret ceremony at Lord Hertford's house in Cannon Row, where Lady Jane Seymour was the sole witness.Soon thereafter, the Queen despatched Lord Hertford with Thomas Cecil, eldest son of Sir William Cecil, on a grand tour across Europe "for the improvement of their education".