Unfortunately, In my experiences, The Ghaznavids tend to meet the same fate as Seljuk and Timur. They just don't happen that often and when they do happen, they get put down in a few decades.
Since...I think it was Rajas of India where the conditions for them to appear were changed and caused them to appear as Courtiers first before going on their crusades. I have seen seen Seljuk once or twice and The Ghaznavids maybe once. I have yet to see the Timurids. This all despite playing several games through to completion.