Parse this person name:

Johannes de Keijzer, 1266-1325, flourished 1286-1304
user
first_name: Johannes
last_name: de Keijzer
middle_names: []
temporal:
- start: 1266
  end: 1325
  type: life_span
- start: 1286
  end: 1304
  type: flourished
titles: []
extra_info: []
assistant