Conversation so far:
Who was Ludwig Mies van der Rohe?
Ludwig Mies van der Rohe, born Maria Ludwig Michael Mies; March 27, 1886 – August 17, 1969) was a German-American architect.
When was Ludwig Mies van der Rohe born?
Maria Ludwig Michael Mies was born March 27, 1886.
Where was Ludwig Mies van der Rohe born?
Maria Ludwig Michael Mies was born in Aachen, Germany
Did Ludwig Mies van der Rohe work?
He worked as a draftsman.

Question: What happened in Berlin?
Self-contained rewrite: What happened in Berlin with Ludwig Mies van der Rohe?