Do you know how to counter Castle Age Janissaries?

Link: https://youtu.be/uwZB14G_8Uc

This game was played on Nomad I didn't know Castle Age Janissaries were that strong. How can I deal with them in Castle Age? Knights and Mangonels are not good at countering them I suppose.

Of course, we should have gone for a heavy tower rush on him in the first place.