Conversation so far:
When did Ruhollah Khomeini return to Iran?
On Thursday, 1 February 1979, Khomeini returned in triumph to Iran, welcomed by a joyous crowd estimated to be of up to five million people.
Why did Ruhollah Khomeini return to Iran?
Khomeini was not allowed to return to Iran during the Shah's reign. On 16 January 1979, the Shah left the country for medical treatment.

Question: What was significant about her return to Iran?
Self-contained rewrite: What was significant about Ruhollah Khomeini return to Iran?