Parse this person name:

Gierschner Geisler, Burghard R. Ljiljana Margret I., 1321-
user
first_name: Burghard
last_name: Gierschner Geisler
middle_names:
- R.
- Ljiljana
- Margret
- I.
temporal:
- start: 1321
  end: null
  type: life_span
titles: []
extra_info: []
assistant