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The first prototype for an Apple tablet was created between 2002 and 2004 — years before the iPad came out.
Steve Jobs told Walt Mossberg and Kara Swisher during an appearance at the 2010 All Things D conference:

I’ll tell you a secret. It began with the tablet. I had this idea about having a glass display, a multitouch display you could type on with your fingers. I asked our people about it. And six months later, they came back with this amazing display. And I gave it to one of our really brilliant UI guys. He got [rubber band] scrolling working and some other things, and I thought, ‘my God, we can build a phone with this!’ So we put the tablet aside, and we went to work on the iPhone.

Via: Buzzfeed