Answer the following question: Facts:   - birth name: daniel chatto st. george sproule    - spouse: lady sarah chatto 1994      - education: aldenham school    - children: samuel chatto arthur chatto    - birth date: 22 april 1957    - name: daniel chatto    - occupation: actor   Based on these bullet points, write a short biography describing the life of daniel chatto .
Answer:
daniel st. george chatto -lrb- born 22 april 1957 -rrb- , previously daniel chatto st. george sproule , is a british artist and former actor .he is best known as the husband of lady sarah armstrong-jones , the only daughter of princess margaret , countess of snowdon , and only niece of queen elizabeth ii .