Conversation so far:
Where was Sigmund Freud born?
Sigismund Schlomo Freud was born to Jewish parents in the Moravian town of Freiberg, in the Austrian Empire.
When was Sigmund Freud born?
Sigismund Schlomo Freud was born on 6 May 1856.
Where did Sigmund Freud go to school?
In 1865, the nine-year-old Sigmund Freud entered the Leopoldstädter Kommunal-Realgymnasium, a prominent high school.
What did Sigmund Freud study?
Sigmund Freud loved literature and was proficient in German, French, Italian, Spanish, English, Hebrew, Latin and Greek.

Question: when did he graduate?
Self-contained rewrite: When did Sigmund Freud graduate?