Moron was an ancient city mentioned by Strabo. Several hypothesis exist related to its location, but a location near Santarém is strongly considered.
Strabo mentions that Decimus Junius Brutus Callaicus made camp on an island near the city identified as modern Almourol on the river Tagus.
Other hypothesis point to Alpiarça.
References
Moron (ancient city) Wikipedia(Text) CC BY-SA