After this, Agnes, Lady Frankland, and Sir Harry Frankland traveled throughout Europe, eventually marrying. They were staying in Lisbon, Portugal when the Great Lisbon earthquake struck on 1 November 1755. Sir Harry was buried alive in the rubble with his coach and his horses, which had been killed instantly. Agnes set out to search for him, heard his voice, and enlisted the help of men nearby to pull him from the wreckage.