Conversation so far:
Where is the team Ajax located?
CANNOTANSWER.
So he was a manager for Ajax?
On 11 May 2016, De Boer announced his resignation as manager of Ajax following a disappointing season when Ajax again lost out on the Eredivisie title to PSV.
What else did he do with Ajax?
De Boer has now won a total of nine Eredivisie championships with Ajax as a player and manager.
When was he hired as a manager?
On 6 December 2010, after the resignation of Martin Jol, De Boer was appointed caretaker manager of Ajax until the winter break.
Did he stay on as a full time manager?
According to reports, De Boer was offered the chance to interview for the Liverpool job but turned it down to remain with Ajax.

Question: Did he win anything else while he was manager?
Self-contained rewrite: In addition to winning nine Eredivisie titles with Ajax, did Frank de Boer win anything else while he was manager?