I have walked this route and wondered why I had never heard of the town. But then I remembered that when I got to Gallur (about 20 beyond Zaragoza), I turned right and walked the Castellano-Aragonés.
Your post piqued my curiosity, and now, just what I need, Zaragoza to Logroño is on my list.
I spent just a few hours in Calahorra years ago as a tourist, and have thought it would be a nice place to spend a few more. And looking at gronze, I see that this route also has a stage to Tudela, another nice place. Thanks,
@J Willhaus!