When did Ilm-ud-din die?

There isn't enough information to answer this question definitively. "Ilm-ud-din" is a general term meaning "knowledge of religion" in Arabic. It is not the name of a specific person.

To help me provide you with an answer, please provide more context. For example:

* Do you mean a specific person who is known by this title? If so, what is their full name or any other identifying information?

* Are you referring to a specific event or period in history?

With more details, I can assist you in finding the information you are looking for.