Parse this person name:

Mart de Backer, 1240-1300, flourished 1270-1286
user
first_name: Mart
last_name: de Backer
middle_names: []
temporal:
- start: 1240
  end: 1300
  type: life_span
- start: 1270
  end: 1286
  type: flourished
titles: []
extra_info: []
assistant