Lafayette Cartee was the first Surveyor General of Idaho Territory, and it was he who established that first point for his survey. The north/south survey line that runs through Initial Point is called the Boise Meridian. One might think that it was a trick of fate that the Boise Meridian is so close to the town of Meridian. If one were a fool. The term Boise Meridian was first, with the town named after it coming along in 1893.
So, if you find an old deed that includes a description with the words Boise Meridian, it doesn’t mean the property is in either Boise or Meridian, only that the description is in relation to that feature of the survey.